Damon Writes:

I spend a lot of time with my best friend and his girlfriend, who I will call "Felicia".  Usually we hang out on the weekends and catch a movie and get a few drinks.  They met about a year ago and my best friend is really in love with her.  I can't blame him because she is really beautiful and is a lot of fun to be around.

My best friend goes out of town quite frequently and its not unsual for me and "Felicia" to hang out when he is gone.  This had been the routine for the last six months and there had been been no hint whatsoever that she was interested in me, or vice versa.  Several weeks ago this all suddenly changed.  We were drinking pretty heavily and the conversation drifted towards some issues she had with my best friend.  I tried to to listen and be a good friend but things quickly got out of hand.  Without any warning she began to confess that she has been cheating on my best friend since the first few weeks of their relationship.  (They live together)

I was really caught off guard and told her that if she wasn't happy she should just leave him, rather then cheat on him.  She sort of agreed but said she just hadn't found a way to deal with it yet.  Well, the next thing I know, she says that she found me very attractive and had been wanting to have sex with me.  I thought she was just teasing but before the night was over I found out she was not. 

Well, we have been having sex behind my best friend's back ever since that day.  I feel absolutely terrible about betraying my best friend, but I can't help myself.  It's gotten to the point where they are arguing quite a bit and she usually ends up at my place.  He usually calls me to complain about her not realizing that she is sitting on my lap while he bitches on the phone.

I don't know how much longer I can keep this up.  Should I tell him or just end this thing with her?

MR. GOOD ADVICE RESPONDS:

You are a pig!  You deserve to get a good old fashion butt whipping and if it happens take it like a man because there is no excuse for what you've done.  You are not this guy's friend, so stop calling him your best friend and pretending that you give a crap about his feelings.  You don't care about him at all.  You are just coming to terms with the fact that you are a horrible human being and it doesn't feel good to be you.

Now, I hope you truly fall in love with this woman.  You deserve to suffer the pain and aggravation she will no doubt bring you in the near future.  Any woman who gets between two friends like that is not a good person and will bring only misery to all that she encounters.  You will get yours trust me.

You write me and ask what you should do, here is my best advice:  Stop seeing this woman immediately.  Stop talking to your so-called "best friend", you don't deserve his friendship, so move on.  Go out and find your own woman and spend the rest of your life wondering why you so easily chose sex over friendship.  Whores are everywhere and good friends are not, it's that simple.  You disgust me.