Need some relationship advice from the gays.

So Im new to dating guys, and didn't really know where else to ask for advice…. so here goes. My bf and I had some problems a while ago. This lead to a break where we both had a few hookups on grindr, but we got back together again. I started noticing he gets weird texts and calls from random guys, and he would always akwardly hide his phone. I re-downloaded grindr to see if he's on and he was, and then we made a rule "youre allowed to look, just not allowed to touch". Fast forward….. I think he's been touching other guys. The sex feels different.

So I guess my question is, can you tell if your bf has been cheating on you by the way it feels down there? Also here's a pic of Chappell Roan