I hate my friends' exes more than I hate my own
That seems extreme. Why hate your friend's exes so much?
I know everything about them, I'm their friend
It's understandable that you are aware of some of the negative experiences that your friend's have had with their exes. However, it is wrong to hate anyone. Instead, you should respect your friend's decision to move on with their life and not hold a grudge for them.
I can't believe some of them are moving on and I'm stuck with her ex
If you feel stuck in a relationship it might be time to end it. Take some of that hate and use it to do something better in your own life.