Lying son of a bitch

I decided to do some snooping around. And I log in into my sprint account and saw that he has been texting the same bitch that he was texting a few months ago. That they were suppose to hook up. I told him not to text her again. And I see her number from a few weeks ago on the history. But I can't see the text msg. He swears over our kids life that he hasn't talk to her. I want to believe him but the proof is right there. I don't wanna leave him because we have accomplished so much together. He didn't hook up with her. But they have been texting each other. After I asked him not too. Idk Wat they been texting cuz he deleted the msg. And I noticed that they only text each other wen I'm either at school or work