You should tell him whats on your mind, but always remember rule #1(kind of tacky, but so true): Bro's before ho's. A very simple rule that if always followed by you and your buddies, 90% of your problems will go away.

This is bad news. I'm sorry for you and your friend's girl. If it were me, I would tell him that although I realize it's probably none of my business what he does, do not involve me by using my account. Also, I cannot be friends with a cheater. I have had friends who have cheated on their wives and they are now ex-friends. I just can't do it. Cheaters are not good people and they do not make good friends.

So true and the thing about this todays society you are judged by who you hang around and cheaters allllways seem to bring there friends into there business and ask you to lie for them.I stopped doin that stuff about 12 yrs ago when itty bitty words became 20 cops in less then 5 mins i hate it!!!

Belvie it or not redline my parents didn't teach me how to respect woman. Well my dad taught me a little. He had a new woman every week. So I got sick and tired of that crap and I said to my self iam not going to be like him. But it seems like any time some one is cheating iam in the middle of it. First my dad now maybe my buddy.

Parents teach two things. What to do and what not to do.

You are wise to see the mistakes your parents made and try to do better. I am NOT dogging your parents, we all make mistakes but if you can learn and do better you are #1 in my book.

8-)

Tip,

His relationship with his girlfriend is none of your business.  If she bosses him around, he cheats, whatever............that's their headache.  If you really object to his behavior to the point where you can't sleep, well then you should tell him, but be prepared to lose him as a friend.

What is your concern is that he betrayed your friendship by sneaking onto your profile and using it for his own illicit activity without your permission.

Now that would piz me off bigtime and I would let him know it loud and clear.

good luck buddy.