can i save my relationship after a misunderstanding

Please help me! I don't know if I'm being delusional but basically, my boyfriend went out of town and took a girl he met on instagram out to dinner. He said that they're just friends but I was super skeptical since they'd never met in person before and also live in different states. I told him that I was uncomfy about it but he went anyway and said I would just have to trust him.

Fast forward a few weeks later, I told him that I was having some emotional struggles and the communication between us drastically decreased. Like no phone calls, and less texts that I can count on two hands. I called him saying that I felt like he didn't care about me based on the lack of concern plus the seeing another girl thing. It turned into a blow out fight. I apologized profusely but he said we needed a break if I was feeling how I was.

After a couple of weeks, I texted him saying how much he'd hurt me and I didnt deserve to be rethought about and blah blah blah. Now I haven't heard from him since. I'm feeling like this is all my fault. Am I crazy?