Trust?

I trust him....... but how come he's making it hard for me to do that. Am now laying down, going soon to bed. I was just looking through his phone when I saw a call and text to his ex. What should I be thinking then? Is anyone thinking what am thinking too? If it were you in my shoes, what would you be thinking then? Am so confused and I don't know what to do........ I need You LORD, help me what I need to do. :'(