I have recently become engaged to my DP of over 8 years and couldn’t be happier. However there is a massive rain cloud over the whole event because of my BIL and his partner. My DP and his brother were best friends for a long time did a lot and spent a lot of time together - his brother is older and did a lot of things with us too. As a family unit includes my ILs we spent a lot of time together. However he got his first serious girlfriend about 3 years ago. I welcomed her in with open arms despite being very different to me however one silly incident whereby she thought I ignored her turned very sour and caused a lot of hurt and upset in the family. I tried to reconcile with her however she just said she wasn’t willing to move on and that there was no need for us to speak. This put a huge strain on my DH and BILs relationship to the point now where they barely speak nor see each other. If I see this woman in the street she will walk straight past me and has ignored me and my OH at family occasions. We are struggling with numbers as it is (there are people we desperately want there but may have to say no to) so me and DP have decided that we don’t want her there. However this is now causing WW3. I understand that this causes problems for my ILs but why would I want someone at our special day who 1. Won’t be happy for us and 2. We haven’t spoken to in 2 years? I feel like if she has made a decision to carry this on what does she expect? I know this won’t sit well with a lot of people but I tolerated a lot of her crap for a long time. It is not just me who has decided this it is my DP also.