Cheating or not? GUYS PLEASE GIVE ME UR OPINION PLS!!!!?

I go through my husbands phone and always see a girls number. He says he met them last year when we were seperated, funny how they barely text now and swap pictures. He met them all on chatline. What should I think? He gets mad and calls me insecure. He also says that I keep him from even his guy friends who are criminals and felons. I'm pregnant and I feel like he isn't happy with us. He has cheated on me before.