best friend is hooking up with my ex?

Question

So I just found out my best friend likes my ex boyfriend that I fell in love with. 
I don't know if I should 
A. Be mad and stop being friends with
B. Be hurt
C. Pretend like I don't care
Or
D. Forgive her
I never thought she would do this to me. She has always been the one to not do bad things and I've never EVER nor would I ever do that too her.

Answer

In my opinion that's really sketchy. Personally I wouldn't be friends with her anymore. There are too many guys out there to date one of your friends exes and obviously you're not okay with that and your "friend" should respect that.

Answer

It's okay to be hurt. Just talk to her, because no guy is worth losing a friendship over. However, this also could be an early sign that she's not as great of a friend as you thought. This has happened to me multiple times with the same guy. Cut one friend off and stayed great friends with the one that's still dating him because I realized that he was soo not what I'm looking for in a partner. Him and her work perfectly, it just sucks that they didn't meet before him and I got together.