I messed up

Soo I cheated on my boyfriend of 2 years. I only did it once but I dealt with so much from him from him having innappropiate conversations with his cousins to giving me an std. So he saw my old phone with messages of me and the other guy talking about having a kid together and how good the sex was. When I got off work yesterday he said "don't you think you should of erase things off your old phone" and I was like damn he saw it. I feel bad about it but then again I kinda don't care. I had to vent to someone this morning. So he broke up with me and thats fine. Because even though I fucked another man I know I deserve way better