Confront him or nah?

I honestly don't know how long he has had the app on his phone. We went to the bank this morning I waited in the car while he went inside I grabbed his phone and saw that he downloaded POF I did the mature thing and didn't snoop around. But now I'm regretting that I didn't check the conversation he was having. He is acting normal for the most part around me and our kids but when he is obviously replying back he would turn a certain way trying to hide what he is doing.

I'm really trying to not be negative and let my emotions get the best of me. What do y'all think I should do?