Trust issues

I have really bad trust issues. I always feel like my partners doing something behind my back or that theirs something I don’t know. Anytime I see he followed someone or even messaged someone I immediately think that somethings going on behind my back. I will admit he has broken my trust in the past but it was almost two years ago and I thought I’d moved on from it.

I feel like at this point I’m just manifesting it to happen again my obsessing over it and constantly feeding into it. Is there anyway to change my mindset? Maybe manifest a stronger relationship? Build back that fear of being in the dark???