I need help!!! What should I do in this situation?

I am married and now separated. In the time of my separation I fell in love with a new guy and everything was so great! He cheated on me and swore that he'd never do it again! I am so insucure now and he has tons of female friends! I have never been the type of female to snoop through anyone else's things, but I do now after I found out he cheated on me. I find new pics in his phone of other women but he swears they are just friends and that I need to trust him. There are texts that I find suspicious as well! He deletes the texts and try not to leave anything behind that will raise any suspicion on my part. I do everything for this man and although he is the sweetest person i've ever met, I feel he's still flirting and messing around on me! Everytime I confront him about it he can't give me the answers i'm looking for or he wants to avoid the conversation.He pretends he has no clue as to what I am talking about! Meanwhile my husband and I have had a lot of problems and have been together for a very long time...a decade to be exact! He has never cheated on me but there were a lot of other issues we've faced and he wants to work things out with me! Although I love my husband I don't know if i'm ready to go back to dealing with the issues I've faced before. I now suffer from anxiety because of all the stress i've been through with him. I can see that he has been changing but I don't know if that will last! Now I am in a new relationship still suffering from heartache and stress. I am in love with the new man in my life but I don't know what to do!!! What am I to do in this situation?