Awww im sorry hun, but a like that dont deserve ur friendship. I bet she will regret it in the end becuz shes losing a good friend over this, just to have a fling or to try and start a relationship (which I doubt will last). But if he ever comes crawling back, I would kick him to the curb and her with him. U dont deserve this and ur very strong for being able to put up with this. That friend of urs doesnt even deserve to be called a friend anymore, she'll later regret all the hurt she's caused. I hope u feel better soon and be strong! U've made it this far, u can make it further.. Watch them crumble while u succeed
shauna