A man being sneaky

Cora

My guy has been acting strange. When I come around he would quickly close his apps and put his phone down. I’m not stupid I’ve been cheated on before and I know how it goes. I want to look through his phone but I’m scared too because I already know the truth. Don’t want to talk to him about because I know he will deny. My question is what can I do? We have 3 kids together and it just breaks my heart that he is risking this family for some new butt. HELP!!!!