My boyfriend and I broke up, now I'm not exactly sure what to do for the next step?

My boyfriend broke up with me about two and a half weeks ago and basically his explanation was that he was having negative feelings like jealously and frustration (which he never told me about before then) & then later on how he'd be graduating next fall and I next spring, so we'd be going our separate ways eventually anyway and how that didn't bother him at first, but now it did. It just didn't make any sense to me because recently before then he had expressed how he was becoming for emotionally invested in our relationship & was even making plans for the summer & was supposed to have dinner with my family only a couple days before the breakup, but canceled b/c his mom was making him dinner for his first night back home, so he didn't want to skip out, but told me all about how he wished he could have come. He said that even though the break up had seemed out of the blue to me, that he had been thinking about his feelings and such for the past couple weeks and thought that the negative ones would go away, but the didn't, which is why he said it was extremely difficult for him to break up with me because I did nothing wrong, but of course he still wants to be able to talk and be friends...after all this, the very next day he tried to text me and start a normal small talk conversation, to which i said i couldn't talk to him until i got over our relationship, and he didn't say anything after that, but after about a week of being broken up i caved and texted him and he said that it was hard for him too...which makes no sense since he's the one that ended it and he'll text me every once in a while to try and make small talk still and instead of ignoring it like i know i should, i talk and continue to have a small conversation with him. We'll probably be seeing each other at a house party this weekend b/c it's a mutual friend...i'm not sure how i should act around him there. I know i'm not over the relationship, but it's not like i could jump back into it even if he asked because it hurt knowing he didn't come to me when he was having issues with our relationship, but rather only went to his friends and didn't even hint that he was having issues. i'm not even sure if he'd want to be back in a relationship though.