Guys ?

I felt like my fiance attention was else where. Everything he was doing was different and nothing I was used to. I decided to go through his phone for the second time ever. I'm two years. And come to find out. He's talkin to numerous females and still in contact with his ex (last one before me) asking for pics and everything. I sent everything I found to myself just in case he deleted it. I would still have proof. I questioned him about it and he kept denying. Then started to say i was crazy. I'm ridiculous for even accusing him of such things. And saying I'm just looking for a problem. When clearly I had proof but i guess that didn't mean much he still kept lying. I left the issue alone then minutes later he fessed up. And felt like I shouldn't even be upset because the females mean nothing and i have nothing to worry about with his ex. Smh idek how to move forward with this.