It's the guilt I feel for leaving someone with an addiction
Women are so conditioned to be sympathetic and supportive and put themselves last ... For men would would be very unlikely indeed to show such sympathy and support or ever out themselves last.
Thank fuck you haven't had sex with him since you found out. He still risked your health, the health of your unborn children (if you conceived during those 5 years) and took away your equal right to decide whether you wanted to have sex within (or stay in) a relationship that was no longer anonymous.
It's an "addiction" apparently. Like others, I'm very skeptical.
Like others, I'm interested to know what intense, proactive, sustained steps he's taken to tackle his "addiction".
You don't owe him anything, you never owed him anything. No-one is obliged to stick with someone behaving like this.
Also I'm curious about the damage and pain to himself you refer to .... Given he's lost nothing by repeatedly cheating on you for nearly a decade. He hasn't lost his marriage, he hasn't lost his home comforts, he hasn't lost his family, he's lost sexual intimacy with you; but he's been getting it elsewhere (oh and that's another indication that he doesn't really care - because losing that with you had apparently not resulted in him stopping his behaviour or tackling his "addiction"). So what pain and loss has he suffered exactly?
Has he been beaten up by partners of women he's been cheating with?
He had lost jobs due to cheating/I appropriate behaviour in work? ( That would be another piece of abuse against you and your family; risking your household income, stability etc).?
Where's this pain & suffering on his part.
It's clearly not been enough for him to seek treatment and stick at it. ... Over almost a decade.