My FI has had the same best friends since he has been in elementary school and all of them are in the wedding and have been super close for years. The one groomsmen "Steve" (names have been changed since...well you never know! lol) dated one of our bridesmaids "Kim" since middle school and have two children together. They recently (2 months ago) went through a bad break up and are currently fighting over custody of their 2 children. Safe to say wedding planning has become more challenging as "Steve has not been cooperative with her still being in the wedding (we don't want to throw anyone out of the wedding because we don't want friendships to end and my FI really wants all of his friends to be a part of our big day). He approached me and even got nasty saying "she is not to be in the wedding" and has been harassing my bridesmaid over participating in and attending wedding party activities that we planned on having in hopes of helping everyone get to know each other better(which are all now up in the air). We had asked Steve if getting along with her would be an issue and he reassures us that it won't be but he has been telling the other groomsmen that he does not want to be in the wedding or wants to deal with his ex and is just upset that we did not kick her out of the wedding. Since this has started he has been picking fights with other members of the wedding party to the point that nobody wants to be around him because he makes everyone uncomfortable (he made inappropriate comments about my best friend and wanting to sleep with her, and just has been full blown rude to everyone). Thus far "Kim" has been supportive and not responding to his combative behaviors and continues to be supportive of me and my FI. We legit do not know the right or wrong way to handle this situation as we don't want to lose friends over this and want to be supportive of my FI's good friend going through a hard time, but it is causing both of us a great deal of stress. And i have been doing everything in my power to not get mad and lose patience but I am getting close to my breaking point lol. Has anyone else dealt with similar issues? I feel like a fresh pair of eyes on this matter would help us out greatly!