PLEASE PLEASE HELP. I NEED ANSWERS.?

[Nicole]

So I found out today that my friend has been giving head and having sex with my very close other friend. I know what you must be thinking, that he is fair game because we aren't dating, but you have to see it like I see it. I've known him since 7th grade, he's helping me through depression, he is 1 of the 3 people who know I self harm, and we both have feelings for each other. Then there's my other friend. Lately she's been acting like a slut, bragging about how many guys that want head from her. So she was on my phone on Facebook talking to some guy, I asked who was it and she didn't tell me anything. She gave my phone back and forgot to log out of Facebook. I went to log out for her but when I clicked the app the messages showed up. Of course I read them.
So here are some of what they said:
Girl
"You wanna hit it from the front and the back"
"Want me to give you head"
"I'm taking birth control"
Boy
"When we gonna met up"
"I don't have a condom"
"Do you have any diseases"

I'm as mad at him as I am at her. Also multiple people saw her making out with him the last day before Christmas break when I wasn't at school all week. Should I let this go? Should I kick her ass? Should I cut him off? So many options, I just want to make the right decision. I'm confronting her tomorrow about it.

So please help. What should I do? If you were in my position what would you feel like?

[Alex]

the same as you,,,, cheated -_-
talk open to him, why he do that to you?

[Mike]

I always look at the weirdest questions. There is only one thing you can do here. Make him forget about the slut. I mean she had to have known. It is like she is doing it on purpose. You can fix that Get yourself an ice cube and some chocolate syrup or honey. Have you done this yet? Ask any guy how that makes him feel when a woman he likes does that.

Then, when you are done grab him. While he is still drooling all over you go to that ******* house and kick her down some steps. NO do not do that part 100% kidding. Just take him there and embarrassment her in front of him. She's never done that, made him feel that way. He will still be drooling & trying to inappropriately touch you. He will just agree with anything you say.

Then leave with him. Tell him you have round two and three planned. Stop short this time. Confidently "yell" at him and tell him how he hurt you. Really think about how he did. You really can't finish until he sincerely makes you believe how sorry he is. You said he had feelings for you. So if he does not be a man, stop what is going on to address your problems / concerns or make you feel better.... He is no man.... Just a jerk.

GL