Random breakup

Iris
So I've been with this guy for about a year and a half. I'm in college and he isn't but I recently decided to come home and do online classes, which he knew about. While I was on vacation this weekend he text me and said that it wasn't working out and that I needed to go back to college and flirt. Like what kind of reason is that?! I kind of feel like he's cheating or that there was someone else and he wanted to dump me before he did anything with her just because cheating is wrong. Another reason that I think he may have done it is because I'm epileptic and the other day he saw me have a seizure for the first time and it really freaked him out. Since then he hasn't been the same so I really think that the seizure may have pushed him away. He stopped touching me, he looked at me differently, stopped kissing me, and just acted so weird. I just feel so insecure about this and I just need some advice and words of encouragement during this tough time. I'm really struggling with this because I thought I was going to marry this man.