Why?

This is a true story, please leave a comment.

In 2004 the guy i loved moved in with my best friend cause he had nowhere else to live.that was okay with me because i trusted both of them.also this way i would be able to see him a lot more.well around my 15th birthday on august 27, my best friend all of a sudden wouldn't talk to me on the phone which made me mad because i didn't know why. well a few days after my birthday, i went over to her house.i knew she had liked him and so i didn't want to be real affectionate with him around her because i didn't want to hurt her.then we went out in her backyard by the trampoline. she then got pissed for no apparent reason. she was like the only reason you call is to talk to him and the only reason you are over here is to see him.i was like every time i call i try to talk to you but you wont and i haven't hardly spoken to him the whole time i have been here.so i went in her house and out the front door and went and sat in her driveway.so her mom opens the door and tells me to come here.so i get up and walk into her living room and sit down. her mom says somebody has to tell her.i was like tell me what? the guy i was in love with was like i will tell her.so he says the other night me and her(my best friend supposedly) got drunk and slept together. that completely blew me out of the water. i cried till 3 in the morning.i usually don't cry over anything. but i knew i would see her at school everyday and so on. so i walked into the house about 4 that morning and i was like we have been friends since 7th grade lets not let a guy come between us.i didn't really mean this but i said it anyway. so she started crying and i was crying hysterically.so she was like this is the biggest mistake i ever made and it wont happen again i am so sorry. so then about 2 weeks later, i find out it happened a few more times.even after they both told me it wouldn't. i was devastated.it still drives me crazy to think about it.you have never felt a worse pain then being stabbed in the heart and the back at the same time.i just wish i knew why...