One question for you:

Did you use protection with this man?

If not, you risked passing on an infection to your girlfriend. Did you consider that you might have exposed her and YOUR OWN child to HIV? This is a huge risk in a heterosexual one night stand, but even more so with a homosexual one.

If I were your girlfriend, I do not think I'd be able to forgive you for putting me at that kind of risk without me having the option to make any choices myself. That level of irresponsibility, lack of consideration and selfishness would make me question your fitness to be my life partner and even be around my child.

Regardless of all of the other aspects of your infidelity, this one alone is big enough for your partner to be justified in ending the relationship. You seem to think she's doing you some kind of a disservice by not taking into account your 5 year relationship. How much account did you take of the relationship, when you got initimate with another person?

If you did use protection and his bodily fluids and yours did not come into contact in ANY way, then good for you. Make sure she knows this, regardless of whether your relationship resumes, to at least set her mind at ease on that score.

If she takes you back....what can I say? She's a better woman than I am.

__________________
"Time flies like an arrow -
Fruit flies like a banana"

M Y - N A U G H T Y - P I C T U R E S ! !