My partner and I (not married) have been together a long time. We have a 12 year old son. Things have kind of ran their course with us really, we don't have a lot in common, never have sex or any intimacy (I'm not interested as don't have much of a libido and also can't be attracted to him due to a lot of what's happened).
But we parent well together, and get along OK for the most part, he does help around the house etc. We have a lovely home, dog, shared family, big mutual friend group etc. Financially he earns lots more than me so if we were to split I would struggle, we aren't married and I would get half of the house but can't see how I could afford somewhere on my own with my wage.
I also don't want to only have my son part time. So I've let him back in every time - I have no solid proof what he is doing but to me it's obvious through his behaviour, he has been very suspicious and also comes across guilty when challenged. But never having any firm evidence I also struggle to walk away as well especially when linked to the above.
I've long suspected he has been unfaithful or at least chasing after someone else. It's the same person every time. I saw a conversation in the past which he would never let me read and that set alarm bells ringing. I asked him to stop speaking to this girl and he did, or so he said. I found out some time later that he was still on Facebook etc with her as a friend and liking all her pictures etc. He insisted she was just a mate and that he didn't fancy her etc. I should mention she's probably 15 years younger than me, and the opposite in looks. I know he's not attracted to me anymore.
Anyway we had a row and he deleted her on all social media etc for a while only to get her back on there a year later. I hit the roof and he deleted her again and said he wouldn't talk to this girl again. But recently I found out (okay I admit I did snoop) that he has been in touch with her again on another chat app. I couldn't read any of the conversations but I confronted him and he lied, til he knew I had some proof. Then he admitted it but again said she was just a friend and that's all it was.
I kicked him out for a while but eventually he came back to the home - he pays most of the bills and mortgage here so I can't really force him to leave. We are back together in a sense but we don't really have a relationship anymore, for me it's for our son and general comfort and finances. I don't have the best self esteem and don't really want to meet someone else but also can't afford to be on my own.
He seems to be quite a shell of himself, and I feel the same and just totally drained. He is letting me look on his phone and ipad etc and seems to be doing all the right things. But how do I know he won't go back there when things settle down again like he has before? I can't monitor him forever and constantly snooping on him all these years has worn me down. I know it's wrong but I just had this instinct. I know something was going on, it might be finished now as he's very open with his phone etc at the moment, but will it stay that way?
How can I trust that he won't go back another time? Could it be that he's learned his lesson now and has realised everything he has to lose and this younger girl isn't worth it? I really hope that would be the case but I've got this niggle in my mind that he's going to find another way to contact her. I just can't trust him and as we have no intimacy anymore, how can I stop him?
We aren't exactly spring chickens anymore so I just dont get why he is chasing after this and seems to value cheap thrills over a stable home life. Has anyone else been in this spot and caught their partner either cheating or acting highly suspicious and they stopped and everything went back to normal? Or did they just do it again the moment your guard was down?