Hi,
I have been sleeping with this girl for about a month. She said she was single and that she broke up with the guy.
Well today he posted something on her Facebook saying they are done and that he heard she was cheating on him. He also mentioned her using drugs. That is something I am totally against. Do I let the guy know? Or contact him so he knows?
Thanks

No, you merely stop seeing the girl and being the other guy.

He isn't your problem, she is.

Best advice- let her know she was/is a cheater and a liar, and you don't want to have anything to do with her.

Or, are you planning on continuing a relationship with her?

Hell no, I am not even going to be friends with her. No contact from me. I was just curious weather or not I should let him know?

I wouldn't recommend it.

If you were a friend, or knew him socially, in other words some connection to him, then I would consider it.

Otherwise, I'd leave it be. He will find out eventually. Maybe she has cheated on him before you, and he's been down this road already. Either way, I'd cut my losses and move on.

First, talk to her. FaceBook postings can be lies and designed to hurt someone. Make certain that this isn't him playing games because she broke up with him when she told you she did. Some people do go for revenge when they get dumped.

IF it is true move on with nothing else said.

If the posting was a lie, decide if you want to be involved in her drama.

Hey, wow... well you'll never guess what happening. I text her and asked her and she just replied "f**k u" I was nothing nice to this girl. Anyway, I saw she posted on his Facebook that she never hung out with me, so I contacted him. He was a very nice guy. They have been living together for 2.4 years... He said she has a coke problem and is crazy... which I agree. He sent me a text from her which said "Don't believe that guy, I didn't even see him. He just lies to females and ruins lives. LOL, so anyway, the guy ended up kicking her out of the house. Now apparently she is sleeping with someone else. I kind of feel a little hurt but I guess I shouldn't since she has some deep issues right?

I agree with Jake but am out of greenies for her...

The guy already knows she's cheating and that she's on drugs and he's broken up with her.

Should you run into him one day and you think he knows it was you, feel free to pull him aside and say, "hey, I just wanted to mention that I didn't know Kate was dating you until I saw that you were breaking up with her on facebook - I wrote her off after that, too. Anyway, I hope there are no hard feeilngs - she kind of played both of us." Short of such an encounter, I'd let it go.

Be glad that you know the truth, now you can move on. Don't need to waste your time dwelling about her anymore.

Yea I agree with everyone else. Since you did double check with her (facebook is not always the best source to get your information) and her response was that rude and nasty I would just stop talking to her and move on. Plus, if she did want to be with you after you found that out, if she cheated on him with you.. what's going to stop her from doing it to you? She sounds like trouble, just leave her be.

I kinda feel alittle hurt but I guess I shouldn't since she has some deep issues right?
Nah, there's never a "shoulda" when it comes to feelings, you can't control how you feel.

Regardless of what you feel, you're plugged in and know enough that she's no good.