I feel like this could go either way honestly. Ideally you'd be able to figure it out before responding.
To that end... I think there's a simple solution nobody's mentioned.
You could just be honest with him and tell him exactly what you're thinking/feeling.
You could tell him that while you accept his apology, but that you you didn't feel he ever saw you as a friend before, and that it's leaving you confused to hear this now, and you don't get why he suddenly wants to see you.
If he's genuinely apologetic and understanding of what he did wrong, he ought to be understanding of your confusion. He should be able to explain himself in a semi-coherent manner, and you'll be able to tell if he's being sincere or if something else is going on. Bear in mind that his thoughts might not be entirely coherent or clear to him either, though... while that can be a bad sign (e.g. he's trying to put a story together and failing), it can also be a good sign (e.g. if he's really changed and still figuring himself out), so you'll have to watch his response and see what he says.
Oh, and don't make it confrontational—leave it open-ended so he can pour out his thoughts and feelings as much as he wants. Then thank him for explaining himself, tell him you'll take a day or two to think it over, and then get back to him with a sincere response. Who knows... maybe you'll find he's a different person now, and/or seeing you differently from how he did before. Getting back in touch with him in that case might be a benefit for you down the road too. Or who knows, maybe you'll get a feeling that his motivation is something else (people here have already listed a lot of possibilities)... in which case, you can tell him you've thought it over, you appreciate his reaching out, but that you'd prefer to move on and ask that he respect that decision. You can soften that a bit by reminding him that you've nevertheless accepted his apology, and (if this is something you can manage, even if you're not entirely enthusiastic about it right now) that if your paths happen to cross down the road, you won't have hard feelings and he can treat you normally then.
On the other hand, if he gets angry or treats you poorly again... well there's your answer.