I broke a heart but am also broken hearted

I had veen dating my boyfriend for 2 and a half years. He was my best friend. We ended things because we are both moving back to our hometowns once we graduate college and I wanted us to have time to work on being friends while we were still in the place. It was amicable. But hanging out as friends right away was probably a bad idea because the feelings were definitely still there. After we broke up I started texting this guy who had been flirting with me before we broke up. My boyfriend knew he was texting me before we broke up and asked me about it and I told him it was nothing even though i knew he was into me. Once we broke up I started flirting back. I liked that other guys were into me. a couple nights later when I was drunk my ex and I met up as friends and he came and slept over at my house. I woke up the next morning and he was gone. I called him and he sounded angry so I went to his house. Turns out he went through my phone when I was asleep and saw all of my texts with the other guy. I thought it was harmless. Just distracting me from the break up but he was so hurt and said he would never speak to me again. He deleted every inch of me on his social media and blocked me on everything. I tried to text him 2 times with no reply. Im so heart broken especially knowing I hurt him so badly. Am I a horrible person? Werent we both kind of wrong? Im hoping he sees the bigger picture but i feel so lost without him now and dont know what to do. Help