My brother is dating my ex

As the title suggests, I have an issue with my brother dating my ex. Let me give you the details. My ex and I dated in high school for a little under a year (typical high school first love kind of stuff), but then she ended up cheating on me and we broke up. After a couple rounds of break up sex and then trying to be friendly during social gatherings, I started to completely avoid her. All of this happened over 10 years ago. In the meantime, she had been married and divorced twice, has four kids with four different guys, and I won’t even go into her horrible “career” choices because I truly only know what people have told me. We did share some of the same friends for a while but now they are only friends with her on Facebook and a few won’t even do that. She had started to comment a lot more on my friends stuff on Facebook, and because of my feelings of dislike towards her and the anger I feel just seeing her name, I blocked her so I wouldn't see anything anymore. Earlier this year, my brother (3 years older) called me out of the blue and told me that he was going to start dating my ex. He said they started talking on Facebook about three months earlier and he felt like they have a lot in common and wanted to let me know about. I ended up being very polite about it and said that “regardless of my past with her I don’t think you should date her” and which he replied “don’t worry about me” and that “she has changed”. She must have changed within only a year because her history shows no change. The last thing that I said in protest was “there is a reason I have avoided her for this long and I don’t see that changing anytime soon” which I don’t. I don’t want anything to do with her. But from what I hear from our parents, he took that as I might be okay with it sometime. I believe that there was nothing I could have said to him to make him change is mind because they have been talking and seeing each other for 3 months already. I am now just sitting back and waiting (and praying) that it falls apart and that he doesn't knock her up beforehand. It has been only 6 months now but I am starting to get nerves about the possibility that they will still be together during the upcoming holiday season. As it stands now, I am thinking of skipping the holiday parties and visiting my family separately at a different time. What would you do?

I am not looking for a way to break them up. I am fine with him make his bad choices. I was just looking for advice on how to handle the situation (especially holidays) where we might meet. I could care less if she has changed, I still want nothing to do with her. And thanks for the non-advice SUSIEDQ. I knew this probably wasn't the place to go for good advice. I just wanted some insight on how someone else might handle the situation.

If my ex and I broke up on bad terms ie him breaking my heart, I would be outraged if my sister began dating him years later. And if my sister still decided to pursue the relationship despite me asking her not to, I think that would cause a rift in our relationship. However, because of the sister/brother relationship, you can not entirely walk away from the relationship therefore you do need to find a way of dealing with it. You know you are not happy with their relationship but don't let them see it. Bite your tongue and try to be happy whenever you are around them. Don't avoid family vacations, go! If you don't then this makes you look bad. Your ex and brother may start thinking you are still in love with her so don't give them the satisfaction of thinking that. This ex of yours sounds as if she loves creating dramas so she is probably waiting for it to start with you. That way she gets to see trouble being created between two brothers and on top of that, she will knock it into your brothers head that you are still in love with her. As I said, don't give her the satisfaction. Sounds silly but put yourself in a situation where you do not like your boss. You have no choice BUT to be polite and pretend to be sincere right? So, when you are around your brother and your ex, put yourself in that scenario. See it as a role play! As I said above, due to your relationship with your brother you can not avoid there presence, so, you need to learn to deal with it and hopefully when they know they are not getting to you, you may just start to see the cracks starting.