Not sure if I'm going to ttc anymore

I know this is bad but I had a gut feeling to go through my so phone . I did this morning. Found messages to a girl saying he would buy her a steak dinner and he bought her lunch before .he hasn't said a thing to me .think we need to have a talk . we've been together for 10 years so I'm not quitting my relationship based on this . I feel a lot of hate building up though . we have 2 kids already . we were ttc the 3rd but now sadly seems like not a good time any more .