I'm not with FOB although we were friends for about a year.
It's a pretty bad situation though - he's in another relationship and we both felt awful after we slept together. I feel so guilty for what we did to his girlfriend that I'm essentially allowing him to walk away without telling her because I don't want to ruin her life. Although, it is killing me that he won't be involved with the baby.
His first reaction was 'get an abortion' as well, but he changed his mind after he saw how much it would affect me to get rid of the baby. He still says he can't be involved though.
The worst thing has been telling my mother the situation. I really feel like I've let everyone down. I've never slept with someone in a relationship before, and I can't believe things have happened like this.