Have you ever stayed in a relationship that broke your trust? Did you stay and how did you manage to get through those trust issues?

I want to hear what others’ experience is with this. I’m dealing with this right now with my fiance and it’s so difficult sometimes to not let myself fall in the rabbit hole of spiraling overthinking and wanting to look through the old accounts to see if I find something new. He used to use dating apps for emotional validation (ex: messaging girls/occasional flirting) as well as watch excessive porn (may not seem like a big deal but I have trauma with it) behind my back due to some things that affected him in the beginning of the relationship — which is in his words “how I coped with what I was feeling, to fill that emotional void”. I honestly didn’t know any of these things until February of this year when I found porn on his phone. Not once did I ever think I’d find the stuff I did but that’s when he eventually told me the truth… over a time span of 1 1/2 months. This was going on since March of last year. Anyway, fast forward to present time, there’s times where something will pop up (even on this mf app) in recents. Or I swear I be seeing google activity and searches but they’re deleted. For example, I saw in recents about 2 months ago these explicit videos. Then they were in the hidden category which is when I brought it up to him. He said that it’s not him and he doesn’t know. He has reset his phone but even then I don’t know. Another example is I went on his settings in his phone, and saw that a search engine option is DuckDuckGo. Like don’t play with me bru. Am I trippin? It’s driving me insane, I feel as if im 17 again.