Husband cheated, how to cope?

It was a year ago, he talked to his ex, as far as i know it didn't make farther but we were only married for 6 months. It's nearly a year later since I found out and it ended. And I forgave for we have a child together, wanted to make it work. But I still have a hard time sometimes. Like sometimes I think he's doing it but its all in my head. I keep to myself with this one because I just can't talk to him about it. I feel like Everytime I come around he puts his phone away I FEEL

But I think it's just all me

Any advice .