This is a messy situation. About 2 months ago, i started seeing this girl, she actually left her boyfriend for me. Everything was going great and i fell really hard for her. Then she changed, she was depressed for some reason, finally she said she just wanted to be friends. I was heartbroken of course, but it gets alot worse. I went for a walk to talk to her, and when i got to her house her ex was there, so i walked home. Curiosity got the best of me the next morning so i flew by again on my bike and sure enough he was still there. I talked to her friend and found out that she was getting back with her ex and that they had fucked that same night. I was outraged because she had been leading me on, so i went and talked to her, i asked her about it(she didn't know that i knew) and she lied right to my face and told me that she regretted our relationship. So i made the choice to tell her ex that she had cheated on him with me, and she had done it twice before, i wrote him a letter and delivered it personally. My question to you guys is do u think that i did the right thing by telling him, even if it means i lose a good friend in her?