I contacted my ex

Hey guys so my ex and I broke up during exams in the beginning of the summer and he did instigate the breakup but I kind of pushed for it to happen because I was stressed and so I was acting a bit clingy and wanted to talk to him about our relationship after he told he had mild Aspergers.
I was in no contact for a while and I noticed that he was looking at some of my Snapchat stories. After sometime I texted him asking how his exams were and he replied pretty quickly telling me they were alright and he passed them and that’s all he wanted. I replied really casually with “that’s great” and that’s it.
I didn’t expect much and I’m surprised that he replied to me. He is not a big texter and he didn’t text me much when we were dating, only to plan meet-ups.
Anyway should I not think much of this neutral response? I really do miss him so much and I just wonder if he does at all.
I shouldn’t tell him how I really feel should I? Because if really did miss me he would tell me that right?
I’m probably going to be seeing him next month when university starts again (we have a mutual friend) so I don’t know if I should tell him how I feel then.
I read somewhere that people with Aspergers have trouble reaching out and might have trouble talking about something like this.
I would like to have some advice on this and nothing like “just get over him” because I am starting to date again but I really feel like we were happy together before all of this happened.

He sent a casual reply to your text and you sent a casual response to it. Don’t obsess or overthink it and don’t text again. Wait until you see him at university and when you get a chance to talk with him, simply tell him you’ve missed him and take it from there. Good luck.