I’m always overthinking stupid stuff that my bf did in the past like sleeping with other girls

He’s never cheated on me not that I know of and I hate bringing up the past shoving it in his face he is a really nice guy he supports me financially so I’m stabled that way he shows that he cared and loves me

But I can’t with this thoughts in my FUCKING head how can I move on and be happy in my relationship?? Do anyone experience the same kind of problems???