Yes, I most certainly have dealt with jealousy in a marriage. I, too, once used that whole comparing his mental illness to cancer analogy as far as my staying argument.
I kept up in therapy, self help, and support groups, in person and anonymously online.
Did his jealousy change, once my reactions changed? Nope. Did things get worse before getting better? They didn't get better. At least I felt better, however...

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