Drowning

I just came out of a three year relationship about a month ago. My ex-boyfriend's older brother married my older sister. So basically now I'm stuck with getting along with him. My sister's husband told me that if Bubba and I couldn't get along, then I can't go over there. I didn't want to be friends with Bubba at all after the breakup because I went through enough during the relationship. But I had to play nice for the sake of seeing my sister. I try my hardest to be nice to him and not start any fights. Trust me...we were great at that. It's almost like he likes to argue though. When I go to my sister's, even though I call him and let him know if I just want it to be me going over there, he'll show up. And he's the one who told me to let him know if I needed time away from him. So I do, but he ignores it and comes over anyway. Then he acts like he is upset and refuses to tell anyone what is wrong. He always say "I'm just tired," or "I don't feel good." I'm not stupid, and I WAS with him for almost three years. I can tell when something is bothering him. Then he gets upset and makes something out of nothing! He'll say "You guys are ignoring me and I feel left out." We ignore him to avoid yelling at him. He goes all emo and just walks out of the house to take a walk. We are going to a party on Friday, and plans changed about ten times during the week as they always do. I called Bubba to let him know that a girl he doesn't like was going to be there. He got all mad and told me that I was choosing the wrong friends. I don't like her either, but she is my best friend's friend. You know how that goes. On top of everything My sister is moving to Texas, I don't know where I'm going to be living in four months, and my dad treats me more like a roommate. I can't handle all of this stress. I need to get away from Bubba for good. I can't really do that though, so I guess all I can do is not go to my sister's house. It gets so bad sometimes that is I think about it too much, it's hard to breathe. I feel like I'm drowning.