I have done reading about cheating and bpd. Seems common enough. I found good info why they do it, etc.
I am close to someone who has bpd (maybe co with npd) and due to his cheating his wife has left for the final time. She didn't know he was cheating. She suspected it but now she knows the severity of it - it is pretty bad.
He is very upset although he has been either cheating or taking action to cheat for over a year that I know of. He also tells everyone he is separated and has been for months - including me (they weren't). He can barely function at this point. (I also don't know if he will harm himself or not)
I am fine being a friend, mostly because I have worried lately that something is wrong and he is in pain - this is bfore his wife got clued in. I admit I am curious why a person, bpd or not, doesn't understand that cheating on your wife means she will leave. (?) It is hard for me to be nurturing with him right now, mostly I want to smack and be like "Of course you idiot - she should leave! Your constant hookups and searching for strange mean good decent wives won't stay!"
I can even sympathize a bit with why he does it but it is escalating and he should suffer the consequences. I don't know if stating as such and keep directing it back to accountability is harmful or just direct. Usually I am direct. I guess I want to understand the thought process behind it. I assume a bpd man knows cheating is wrong unless the wife is on board with an open marriage. I also didn't see any stop to this, I saw more escalation. However one wants to justify it - there is a price to pay for bad behavior. I will lose my job if I don't who up for work, no matter what is causing the issue...just as I cheat on my spouse he will leave me eventually (likely).
and I am very afraid he will hurt himself, it is keeping me up nights.