How to overcome being cheated on with a new partner?

how-to-overcome-being-cheated-on-with-a-new-partner?

A year ago I was seeing someone who was thoughtful, kind, always cared about if I was feeling good, just an overall good guy. He was a classmate of mine.

Turns out he had a girlfriend that I later found out about and it kinda destroyed me for a while.

Now a coworker messaged me, we’ve been talking, gone on a few dates and hooked up.

He’s also thoughtful, caring, kind, etc, and all I can think about is how he’s also gonna betray me, cause he kinda reminds me of the other guy in terms of personality.

He hasn’t done anything at all that would make me think that, I’ve expressed my concerns, and he assures me everytime, but my head keeps telling me he’s not trustworthy.

How do I overcome this?