I don't even know if this is me being snarky or if I have just had enough. My future MIL is mental and I am not just throwing this term around lightly. She constantly picks fights with my fiancée and then threatens not to come to our wedding. Our wedding is a destination wedding and although my fiancée and his parents aren't particularly close, I know he would like to have them there. This weekend she picked a fight and then sent me a cryptic message stating that her relationship with my fiancée is irreparable and she just wants him to be happy so she has to leave him alone. I didn't realize until after I shared it with my fiancée that was her way of telling me she isn't coming to the wedding. I honestly find the constant threats of not attending cruel and it is draining balancing her emotions with wedding planning. My mother passed away a few years ago and dealing with her not being there is tough enough, I don't need nor want the extra drama from this toxic person. I want to politely acknowledge receipt of her text but then again I really don't want anything to do with her. Has anyone dealt with anything like this? How did you handle?