Encouraging words

Please nothing mean , okay so the guy I’m with has said terrible things to me and I have caught him on dating sites before .. I forgave him but it’s stills bothers me & I look through his phone & I never see anything . Sometimes I feel like I’m looking to find something. How do I stop that? How do I not worry myself up? How do I stay happy. I know he’s not doing anything but I’m always just checking and making sure?