From what I read, it's not clear to me if you spoke to your fiancé about how the nasty treatment she gets from her twin makes you feel.
You cannot force yourself to like or accept the sister, and your fiancé must accept that that's how you feel.
And also, what Bill3 said:
Quote:
Originally Posted by Bill3
With regard to your fiancee's self-esteem: in my opinion you must remember that you are her lover and not her therapist. Your job is to accept and love her as she is. Does she see a therapist? If so, that could be helpful and you can certainly encourage that. But your fiancee's relationship with her sister ultimately is up to your fiancee, not to you.
You said that your relationship with her sister is a dealbreaker for your fiancee. How much of a dealbreaker is it for you?
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You cannot also change this situation by yourself. That's between the two of them, they need to sort themselves out. That's their family business, best not to interfere with that or soon there might be even the parents joining in on the fight and you'll end up caught in the crossfire.
Best of luck to you!