Would you forgive someone if

they got upset at you, but instead started insulting your children? Not to their faces, but to you through a text?

Long story short, my sister got mad at me because I said (during casual conversation, her actually saying her boyfriend was getting on her nerves by being controlling) that I didn't think she should have her boyfriend living with her daughters while she is still married to their dad legally. She got mad at me and cussed me out, but instead of actually insulting me she just went for my kids and husband. I was not only mindblown at how quickly she got mad but also that she started talking about my loved ones (her nieces and nephews, and brother in law who mows for her and rakes her leaves off the roof so she doesnt have to get up there.) She has been out of state with her husband for 8 years up until a few months ago when this new guy was magically with her within 3 days of her coming home. I had no idea how much she had changed to be this way or why if offended her so much when she was JUST talking about how tired of him she is. I am just really angry and really hurt and to be honest I don't want to forgive her for that, sister or not.