Search Results: how can i trust him more

I'm impressed with my parents' endurance, given their past infidelity decades ago. Obviously I was too young to even form sentences at the time. Actually I wasn't even born when mom cheated first and they weren't married yet. Yup they still got married later on.

Mom got caught (on his couch with his former friend... the journal I read had the graphic details of it, more than what I'm even posting) and dad cheated back years later but at least he felt terrible and confessed himself shortly. I know they worked it out long ago. Though if the cheater got caught, can trust really be regained in that case? If they confess at least there is a small chance since the person came clean but if they got caught, that has to be nearly impossible.

Apart from the hard work they did, I would like to know how is the relationship like if they stay together. Can a human really be capable of forgiving and forgetting that and regain trust if they wanted to? Personally I don't think I can work that, no matter how much counseling sessions, no way I would overcome that.

Let me elaborate a little. Now, I know of course you want your SO and your friends to get along, and hanging out altogether shouldn't be an issue. But I've PERSONALLY always been of the mind that you just don't hang out with your friends SO's privately or talk to them privately. It feels like a line that shouldn't be crossed to me.
Well I have a close friend who views this a little differentially. She sees no issue with it if we all trust one another. We both recently met guys and have started seeing them, however both of us were friends with each guy before we really started "seeing" them if you will. We met her current SO first, nice guy, and again, we were all friends before they started getting serious. Even before they officially announced anything, I could TELL it seemed to be getting serious so I backed off and do not and have not spoken with him privately outside of what's said in front of said friend or in a group chat that she is in.

Now fast forward to meeting my SO. Again, we met mine at the same time and were friends with him before anything started. From the start he was definitely kinda seeking me out, talking to me more than her and what not so it wasn't really a surprise when we started seeing one another however, unlike the boundary I have myself not to cross... she doesn't really seem to have issue with trying to seek him out alone to hang out with or talk to privately. To my understanding my SO is not really receptive to it. Doesn't hang out with her when she offers, and it's hit or miss if he even responds to her when she tries to message him. Not that I've pressed for details, but they've both vaguely mentioned it here or there.

I don't want to be "controlling" or "toxic" or seem like I'm trying to commander their friendships, but I just am unsure if I'm the one with the issue or if there really is something weird about this.