It's complicated, but I'll try and keep it as brief as poss:
MIL has warned me in the past that SIL is a trouble maker. I gave SIL the benefit of the doubt as I always felt I got on well with her.
8 months ago SIL came for lunch. Just after DD2 was born SIL had been working with DP, he gave her a temp office job. DS2 was still v young and I was feeling a bit sensitive about post-baby weight. She started talking about how some of the office girls had "fat" days when they pigged out, which personally I think was a insensitive topic, esp as it was obvious I had put on a bit of weight. It was also the way she said it, not fat but FAT.
SIL then went on to say that DP was always jumping in the work van with a particular office girl and going for lunch. DP can be a complete arse, but that's really not his style. I stupidly believed her, if he had been going for lunch with her as friends he would have mentioned it to me, which he hadn't so he must have been up to no good. I was at that vunerable, extremely tired stage and not feeling particularly great about myself, SIL knew that, it was obvious. In short, it led to major arguments, self-doubt and general misery.
When DP called her for an explanation, she sait "Nothing to do with me, it's your prob, you two have got probs".
(She also behaved as if I was a comlpete madwoman when DD1 had MAJOR tantrum when we were out once, DD2 was 5 weeks old, it was too much to handle, so I decided to take them home. DD1 was being totally out of order, I know it was harsh but she never did it again. One of my oldest friends was there with her parents, they didn't bat an eyelid when I said I was going. They understood, they have been there.)
DP and SIL havn't seen or spoken to each other since.... As it's Christmas, they are meeting today with our DCs, TBH I would like to go and don't want to miss out .... but part of me can't be arsed to make an effort with her anymore, esp when she treats me like that.
AIBU?
For the sake of family peace, should I make the effort and go? Not sure if I'll be able to control myself if she pulls another stunt like that again.