Explain to him why you don't want to be around him, then avoid him.

However, just because you are avoiding him doesn't mean that you have to avoid your friend. You can still hang out with her every once in a while, ask her over for a girls night out, go to a "girls only" movie, etc...

Just because you aren't going to be around him, you shouldn't drop your friend.

aww.that makes me sad.u know u cant be with him.just think of the baby.he needs a good home life and it would be so much better if he grew up with his parents together.u shouldnt be with that guy anymore because it will tear apart the babys life and your lifetime friendship.

I suggest you forget him or go away from their life...
its not good cheating your best friend,, and NOT At all when she is having a lil baby with her...
he is surely cheating on her.. whats the guarantee that he wont cheat
its like he wants the benifit frm both the sides...

and dont tell ur frnd about anything that happend between yu and him.
just go away from her life.. and tell him straight that you are not going to see him anymore

and start dating some other men.
believe me there will b lots of single men, who will love to b in love wid u

cheers

hope u take a right decision

Since a baby is involved I can't condone infuincing their lives. Yes, do think of the baby, and at the same time think of it's parents, the concaquences of upsetting a family. You can still be friends with her there's no reason not to unless the temptation of the one she's in love with is too much for you to bare. Talk to him, explain that you and him can not and will not be able to be together.

It might sting a little at the time but you will find someone who doesn't have a family to be with, work your way into a more natural situation and in the process you get to keep your friend. Everybody wins.