Mean guy suddenly nice?

So I work with this guy and I’ve known him for 3 years. He was nice at first but suddenly turned against me. He was very mean and nasty to me most times and I never knew why. For a whole two years he was very mean and was the reason I was getting singled out of work projects and from other coworkers. He’s been suddenly nice to me for the past few months and as days go on i can’t stand him. In the past I’ve tried to be nice to him and try to get him to be cool with me but he was always rude still. He keeps trying to be cool with me and I haven’t been with it so he tries to make me feel guilty for not forgiving him. He’s making it look like he’s nice and forgiving and I look like a person who is holding a grudge and just a terrible person when in reality I’ve tried to be cool with him several times in the past and now because he wants to be cool we have to be. What do I do?

Mean guy suddenly nice?
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