Dealing with Heart Break

I’ve (f20) been in a situationship for about 8 months and I finally pulled the plug yesterday afternoon and broke things off. He (m31) hasn’t responded to me and now it’s 6pm the next day. I am heartbroken and left hurting because I expected so much more from him. Maybe 8 months isn’t a very long time but I felt a lot of intense emotions during those months. I was able to let my guard down sexually and emotionally (im a SA victim) and (I thought) I was able to really share my hopes and dreams with him. We met in May when i was still at community college and graduating that spring. Through the summer months we saw each other every weekend, all the way up til September, when I moved to my university. I started noticing that he wasn’t putting in as much effort a few weeks before I left for university, yet I continued to plan dates, talk to him everyday and FaceTime often (he lives abt an hour away from me). He would start to not text back for hours at a time, and would even wait until 10pm to text me back (a few days I didn’t text the whole day to see if he would make the effort to reach out). If I didn’t put in the effort that I did, we probably wouldn’t have seen each other nearly as much solely because he stopped initiating dates about 3 months ago. I get that he works, but I have school and I made sure to make him feel reassured that I wanted to continue to see each other. I’ve been back home for a concert and a few nights ago on the phone, I brought this up to him and (realizing later) that he tried to gaslight me into thinking that we both put in equal effort. The morning after I wanted to send him voice memos, laying out my exact reasonings why it’s important to me that we both initiate things and communicate to him that I respect him too and apologize abt the way I brought the whole thing up. However later that afternoon, I had a talk with my Dad about things on the drive back to my university and realized that I needed to end this with him. I already hadn’t heard from him at all that day (he would frequently do this). I need clarity and I need reciprocation. I have a history with choosing men with avoidant attachment styles and ending this situationship has really hit a nerve. I texted him when I got back to my apartment at university, telling him that we should take a step back because I have some emotional baggage to figure out (which is true because I would feel insecure and jealous but never expressed my jealousy to him) and that I’m not in the right headspace to continue this with him. He has yet to respond. It’s been more than 24 hours. I know that I should’ve seen the red flags sooner, but I ignored them because he had treated me so well in the beginning. There were so many little problems that I had but I was convinced that he would eventually put more effort in. How can I avoid these types of romantic situations in the future?