I am so hurt by the way my relationship with my ex ended... We broke up almost two years ago, and after about a year after our break up, we were able to be friends again. So, over the past year, we've been friends. He would sometimes initiate conversations with me about our friendship saying that he considered me one of his best friends, and that I'd always be in his life. During this time, he was dating other people, and I can honestly say I'd gotten to a point where it didn't hurt to hear about it anymore.
So, long story short, he starts dating this girl. We'll call her NG (new girl). They had a really rough start to their relationship. During the first 4 months they dated, they broke up three times. Once, they remained broken up for 2 months. So, during this rocky time, he constantly turned to me for support, advice, etc. Being the dumb person I was, I was always there, as I am with all my friends. Then, literally, THE DAY they got back together, he emailed me and told me we couldn't be friends anymore because NG didn't want us to be friends.
I'm really hurt by this. For the last 4 months, I was the one who was pushing for her, giving him advice (which worked...)

and then suddenly, I'm out of his life.
I can't stop thinking about how much I want them to break up. So, does anyone have any ideas on how to break them up? I know that I am acting very childish, and that these thoughts are really unhealthy. But I'm hurt... and I want them to BREAK UP!! So, give me ideas!