From a recent Dear Prudence column:
You can read Prudie’s response here. This would be one of the rare occasions you’ll find me saying don’t MOA. If the LW hasn’t already, I’d suggest finding a good therapist. Even if she’s already been to therapy and quit, she should go back if only to deal with the aftermath of viewing those photos and glimpsing the family life of her ex-husband and sister. I’d also tell her she never, ever, ever has to see or speak to her sister or ex-husband (or niece, for that matter) ever again. If she can forgive them in time, she may find that that gives her a sense of peace, but that doesn’t mean that she has to have a relationship with them. Her parents shouldn’t expect that their two daughters will ever eat together again or share space under the same roof unless it’s at one of their funerals. And the LW should never feel guilty about that.
I’d also remind her that the photos people post on Facebook never reveal the whole truth. They are but a representation of what most of us wished our lives looked like all the time. Peel back a layer or two, and there’s always more to the story. I mean, behind the smiles of her sister and ex-husband is a woman who is now married to a man who got his wife’s sister knocked up. That’s hardly the kind of husband most women wish for and certainly not a life worth envying. Meanwhile, every time the LW’s sister shows up to her parents’ home for Christmas dinner or some other occasion that should be a happy one, the empty seat at the table and the disappointment in her parents’ faces that one of their daughters is missing must be a constant reminder of her stunning act of betrayal and gross lack of moral character. But there’s probably not a photo of that on Facebook.
If you have a relationship/dating question I can help answer, you can send me your letters at firstname.lastname@example.org.