if there are any survivors of repetitive, serial infidelity lasting many years?
I don't think so. The cheating is built in, like an engine is built into a car. Like a sim card in a cell phone. Like blueberries in a muffin.
The cheater I married has gone through two SILs, one step-aunt, three or more COWs-at least two married, a single nurse, various waitresses and checkout girls and probably mostly sex workers.
I did throw him out once and regret everyday letting him move back in. My biggest regret, though, is not walking out of the big cathedral the day of the crime. I am not a survivor.
Is it ever possible for a marriage to truly recover or heal from this type of betrayal?
I don't think so. A cheater, a true serial cheater, cheats as a way of life. It's like breathing air for them. Cheating is expensive, as I learned when I suddenly had to cosign a loan for $40,000 to get the cheater I married out of debt.
So you want to stay with a serial cheater? Does he have the opportunity to give money to a sympathetic GF/relative to save? Can he designate someone else as beneficiary to any accounts? Does he have property or investments that you know nothing about?
Then there is the lying. You will never know what your reality is. Cheaters lie all the time. Serial cheaters like lying and practice lying like normal people practice good hygiene.
The stress it takes to be lied to every day, to be suspicious every day, and worse, to eventually not care much anymore, takes its toll. You'll find your body's weakest points. Stomach problems, heart problems, high BP, headaches, getting sick or getting colds more easily. Then there is the damage done to your psyche or your intellect living with a selfish oaf or overaged brat instead of a caring and engaging partner.
I haven't mentioned the callousness. You really aren't a person to the cheater. You can work, cook, be attractive and outgoing, but you're no more real to a serial cheater than what he needs from you. He will wear you down to a little nub as you try not to care or try to ignore.
It's demeaning living with someone who can't care and will never care if you live, die or disappear in a puff of smoke. The years go by fast and your options quickly run out.
Run. Run like there's fire behind you.