Feeling stuck

I've been with this guy since I was 16 technically. We broke up last December, had our time away from each other for 8 months. We talked ava hung out but it wasn't like it we were dating. Although we talked about getting back together. Finally I feel like I'm ready to be back together and 2 months in and for some reason I feel stuck. I feel like cheating. I can't get to the bottom of why I'm feeling like this. We talked about it and everything. Just don't know what to do. Any advice will help 😭😭