I have a girlfriend. She is friends with this other dude and they talk. My girlfriend and this guy used to fuck and he still has feelings for her. They talk pretty much everyday. He keeps giving her shit for being with me and keeps talking shit. We recently had a big fight and she was ready to jump ship. She wanted to go meet up with the guy but I didn't let her because I was desperate to keep her. I don't know if they met up after our fight but, she says she loves me all the time and says she always wanna be with me but keeps talking to this guy. I'm so insecure that I check her phone but I don't see the texts in context cause she deletes his texts. It's funny cause she always checks who I text and looks at my phone too. I feel a tingle in my nuts, my instincts are going crazy and all I can think about is this bitch cheating on me. I just wanna know what the fuck is going with this dude and her. I rarely mention this dude and never say anything about it. A while ago she promised to not talk to him but after our huge fight she started again. All this sneaky shit is driving me insane.

Am I crazy? How can I know whats going on with her? Should I know whats going on with her? Should I break up with her cause I can't take it? How can I be the better man?