Why do so called friends break your heart?

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I had a friend who was a best friend for 11 years. But she messed that all up. I had a boyfriend who I was in love with and we were arguing and she had talked to him. Well before I know it he is throwing my stuff out the door and telling me to tell her to hang out with him. She promised me she would not hang out with him let alone talk to him, well two days after I moved out she moved in and lied to me about it for almost a month, and then I found out. Well then everything hit the fan at that time of course. I was infuriated and couldn't understand and all she had to say was I am sorry we just click. I am so sorry. Well at the time I had a friend who was a guy, who just so happened to be the guy I had hooked her up with. Ok pay attention it gets crazy here. Well he started calling me and telling me how she screwed him over. Which I had already known. So I get a call from my ex and he asks how to get to her moms house and I lied to him and said I didn't know because I didn't want to be in the middle of it all. Well I got ahold of her and she had her ex over there lying to him and leading him on again, and my ex showed up over there ready to kick his butt because he was in bed with his now woman. Anyways she is still leading my friend on and my ex and she has been talking crap to my friend about me that is a guy. What the heck am I suppose to do? How am I suppose to feel? Should I continue to talk to my friend that is a guy even though he is still in contact with the girlfriend that stole my man? I am so lost here and I need some help? please