My husband has been secretly paying his ex-wife’s mortgage for three years. On a house I’ve never even seen.

Mark was married before me, briefly, in his twenties, to a woman named Diane. They split amicably, no kids, no house together as far as I ever knew. He’s mentioned her maybe five times total in the eight years we’ve been together. I never had a reason to think about her at all.
Last month our bank flagged some unusual activity while I was reviewing our joint statements for taxes. A recurring monthly transfer, same amount, same date, every single month, going out to an account I didn’t recognize. I asked Mark about it, expecting some boring explanation, a subscription, a forgotten bill, something normal.
He got quiet. Then he told me it was Diane’s mortgage payment.
I asked him to explain, because nothing about that sentence made sense to me. He said that when they divorced, he’d agreed to help her with the house “temporarily” until she got back on her feet financially. That temporary arrangement started six years ago. He has been paying her mortgage, in full, for the last three years specifically, which is the entire back half of our marriage, without ever once mentioning it to me.
I asked him how much money we’re talking about. Over three years, at the amount showing on our statements, it comes out to just under forty thousand dollars. Forty thousand dollars of our joint money, going toward a house I have never seen a single photo of, owned by a woman I’ve met maybe twice, without my knowledge or consent, the entire time we’ve been married.
Mark’s explanation was that he “didn’t want to worry me” and that he planned to stop “eventually” once Diane was more stable. I asked him what stable even meant, since apparently three years wasn’t enough time to hit whatever invisible finish line he had in mind.
I am still living in the same house as him right now, and I genuinely don’t know how to look at him the same way. This isn’t a small secret. This is nearly a decade of an ongoing financial relationship with his ex-wife that he actively hid from me, using money that was supposed to be ours.
I haven’t told my family yet. I haven’t decided what I’m doing next. I just keep replaying every joint financial conversation we’ve ever had, wondering what else got left out.
So tell me, is there any version of this that isn’t a dealbreaker, or does secretly funding your ex-wife’s mortgage for three years inside your current marriage end the conversation immediately?
Follow for the update, because I just found Diane’s number and I’m considering calling her myself.
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