I don't have a close relationship with my SIL.
Things have previously been said by SIL to me about me not understanding men's needs etc and it was obvious her brother's needs were not being met. There were also remarks made about me not feeding DD properly and SIL also had a screaming meltdown in our house whilst DD was asleep. Since then, I have kept her at a distance and I don't engage with her on WhatsApp / social media. The only time we really have contact is if we are visiting the in-laws. DH thinks I am holding a grudge - perhaps I am, but I just can't forgive her for those comments regardless of whether she was depressed at the time or not.
SIL lives approx. 4 hours away. Her husband divorced her a 3 years ago and since then she has become depressed and being around her can be a bit like walking on eggshells - over Christmas a few things I said she took out of context and we ended up sitting having lunch together in silence whilst DH was out with in-laws. I find it just awkward being around her. She looks at me in a certai way that makes me feel like she things I am scatty or just ridiculous.
A few weeks ago MIL contacted me asking if her, SIL and nephew could come down for a week so SIL and nephew could have a holiday. She gave me some dates, but I said they wouldn't work as we have a few things on, one of which was a surprise weekend I had planned for DH. I thought that was the end of it, but over the BH weekend SIL messaged DH asking the same question about coming to stay and how depressed she is and how much she needs a holiday. DH said yesterday that they wanted to come down over the weekend of x date. I said that wouldn't work because I had arranged something and DD was going for a sleepover at my parents' house.
DH didn't believe that I had arranged a surprise weekend and went on the defensive about me obviously not wanting his sister to come and stay or have any of his family to visit. He went on and on and in the end I told him what his surprise was. I ended up telling him because I felt it was the only way for him to understand that I had already had something planned. I told him that SIL was welcome, but I was obviously reluctant to have her here again after previous behaviour and he should respect my feelings around that.
So the surprise is now ruined and I feel that whilst yes in a way that it was my own fault, due to this protective relationship he has with SIL that I was being made out to be a liar.
AIBU to just feel really peed off that anything around SIL questions my honesty - for context DH didn't believe me when I told him the things she had said around me not understanding that men have needs etc. I feel like I am constantly in the wrong.