There was never a disagreement over who had done worse atrocities. The relationship ended gently (a rarity in and of itself), and others just opted to keep whining about it. Also, Willow was completely willing to forgive Oz, but he chose to go since lives were in danger in his circumstance.
In short, yes, Oz does forgive Willow.
Oz attempted to explain that he felt he had no option, but she ignored him. Oz chose to leave Sunnydale after saving Willow from Veruca's assassination attempt in order to learn how to manage his lycanthropy. Oz left Willow once, knowing she was happy with Tara, since he couldn't really cure his lycanthropy. However, when Willow asks him if he will return, he tells her he will try.
Oz appears in "The Body" where he helps Buffy find the body of a girl that was killed by Riley. After this incident, it is revealed that Oz has become a regular at the Magic Box, where he drinks alone and listens to oldies music. He also starts dating Joyce Summers again. It is later revealed that Oz was hired by Glory to kill Buffy, but he fails and is captured instead. Glory then uses her power to turn him into a werewolf like herself. With no choice, he joins her side and fights against Buffy. At first, he tries to help her by killing vampires but eventually turns on her. Eventually, he is defeated when Buffy stabs him with an arrow that has been dipped in salt by Xander. Before he dies, he tells Buffy that she is not responsible for what has happened and that she didn't mean to hurt anyone. At his funeral, which is attended by many of his former friends, Giles says a few words about him.
Oz returns in Hellmouth where he helps fight off the demons that attack the school.
The only time this happened was because of addiction and then tremendous sadness, which, when paired with trust difficulties, made the scenario more convincing. Willow is sobbing because, even though she no longer wants to be in a relationship with Xander, she has been in love with him for years. She believes that if he found someone else who could give him what she cannot then it would be okay, but deep down she knows this isn't true.
Willow's crush for Giles, on the other hand, never went away, and it faded completely as the series progressed. Giles once referred to her as "the greatest of all of them." Willow, despite her immense respect and affection for Giles, disapproved of Angel's efforts to resuscitate him, viewing them as a catastrophe. She also did not like that Spike was placed in danger when she used her magic to save him from death.
But still, she loved him even though he didn't love her back. And at the end of the series, they both died together saving the world from destruction at the hands of demons.
Willow had many boyfriends and girlfriends over the years, but none of them ever lasted very long. Her mother's death when Willim was just a child caused her to be an unhappy young woman who turned to drinking and partying to cope with her pain. When Willow was about 16 years old, she met Xander Harris, a popular new student at Sunnydale High School. They instantly connected because they were both looking for a way out of their miserable lives. Xander showed Willow how fun life could be if you didn't worry about money or status, and he taught her to enjoy herself while she was alive instead of waiting until after she died.
After graduating from high school, Willow joined Xander at his college in Colorado, where they started their own witchcraft shop. They traveled around the country helping people with their problems for a living.
They are only discovered because Oz has wolf senses and can scent Willow's whereabouts. Willow and Xander have known one other since kindergarten. They believed it was their final day on earth. As a result, they kissed each other farewell. This also explains why there were no sexual tension between them in earlier seasons - they were just friends.
Xander becomes the new Sun King and rules with an iron fist as Willow looks on lovingly at his side. He is determined to save her from death so they can be together forever. Of course, this is all a dream sequence but that doesn't stop him from doing whatever he can to keep her with him. At first, she refuses but then agrees to marry him if it means staying alive. She wakes up married to Xander and the two of them live happily ever after.
"I requested that plot from the filmmakers, and I felt honored to represent those who aren't typically portrayed on TV." Willow departs for Queensland this week, trying to reunite with Alex, with Amber (Maddy Jevic), Irene (Lynne McGranger), Dean, and Bella (Courtney Miller) present to say farewell. They all agree it's best if she stays away for now.
Willow returns in the fourth season premiere, which takes place three years after her departure. By then, Alex has met someone new and they have a baby girl. He doesn't want Willow around because he feels like she's responsible for Liz's death, but also because he knows how much she needs the space. Irene talks him into letting her come back because she wants to make things right with Willow. The two women reconcile their differences and Willow moves back in with Alex.
Liz still comes to visit from time to time, but she and Willow are no longer close. In fact, when asked about her relationship with her sister, Liz says: "I don't have one anymore. We were kids. We had different parents. We grew up differently. There was never any point where we looked at each other and said 'I love you' or anything like that. It's just not something we did."
So why leave her at home and away? And more importantly, why take her off the show?
The short answer is money.
Their restored romance was cut short when Tara was killed by a stray gunshot shot by Warren Mears, sending Willow into a downward spiral of grief and revenge. At first, it seemed that marrying Darryl would give her comfort, but she eventually realizes that he isn't the one for her, just as she isn't the one for him.
Willow decides to move on from Darryl's death by going after Galen, who has been resurrected by the demons during their war against the Slayer and her friends. Using her new powers, she manages to kill Galen again, this time permanently. She then turns her attention to the newly reborn Sunnydale High School student, saying that she will not rest until every demon is dead. It is at this point that we are told that Darryl has also died.
Without her friends by her side, Willow takes out her pain on those who have harmed them. First, she goes after the mayor, who had sent her away to live with an uncle after she turned 18. When he doesn't die, she burns down his office building. Next, she seeks out Adam and Eve, who had created the demons in the first place. When they don't die either, she uses their own son, Cain, as a human sacrifice.