I think this problem kills a lot of relationships before they even start. I got a homeboy who was in the exact same situation a few years ago. He met a girl who was an easy lay, one month later he's staying with her, and a year and a half later they gotta kid together. They called it a relationship, but it ain't seem like it from the outside because they didn't have shyt in common and didn't do any of the shyt they liked individually together; they just stuck with it until the infatuation wore off and he just bounced, leaving her completely heartbroken. Seems like you're headed down the path of break up anyway, so I say dead it now, and not just because it's the right thing to do. You gotta think about it like this; if you get you a side chick and she catches you, she's gonna use the courts to fukk you every chance she gets since ya'll got a seed now, and I've seen it happen quite a few times, so keep that in mind.