Welcome to adulthood. You had unprotected sex with a woman who clearly wasn't using birth control, which is so irresponsible on both your parts. Did you get tested for STIs afterward? If you didn't, you definitely should. I'm not saying that to be rude, I am saying it because your sexual health should be of the utmost importance, and if you have slept with your girlfriend after having sex with this other woman, then she should get tested as well.
You say you love your girlfriend, but why did you cheat on her then? And with someone you seem to dislike so much? Maybe you need to figure out what your problem is before you consider being with anyone. Your girlfriend sounds like a real strong, forgiving woman if she is willing to stick by you after your blatant disrespect for her and your relationship.
Here's the deal though, you have absolutely zero say in what this woman decides to do about her pregnancy. I'm not sure how custody and child support works in your country, but if she names you as the father on the birth certificate, you're basically f*cked for life (and I highly suggest getting a DNA test as soon as possible, which I believe is around 14 weeks at the earliest). If she does decide to take the pregnancy to term and have the baby, you don't really have a say in much about it. You can decide to be a deadbeat, absent father, or you can make an attempt to co-parent. You absolutely NEED to talk to this woman and figure out what decision she is going to make, and it's not going to be an easy one for her either. She has to take responsibility for this just as much as you do, and unfortunately, your current girlfriend will suffer the most because even though you don't have any say in what choice this woman makes, your girlfriend has even less choice.
This is too bad. I know a lot of what I said here may sound harsh, but you need a wake up call here. It is totally sh*tty this is happening, but it's time to grow up and deal with it in a mature way. That's all you can do. Talk to this woman, find out what choice she is going to make, and then go from there. I hope that your girlfriend sticks by you through this, but be prepared for the fact that it may become too much for her.
Last edited by melancholia; 30-06-16 at 10:41 AM.
"Caring is not an advantage."