Let’s get this straight. You were having sex with your best friend. When you started dating another girl, you decided to continue everything but the actual intercourse with your best friend (which is still sex no matter how you want to paint it). You are unsure if you still want to be dating the other girl, but you are still continuing to have relations with your best friend and wondering if anyone should be feeling bad? Does the girl you’re dating (or are you still dating?) know about your best friend and what you are doing? If three, generally sane adults consent to the arrangement without coercion on any part, what you do is your business and I say enjoy. However, I have the strong feeling that your dating girl does NOT know. Is that fair to her? And, if you are questioning why you are dating her at all, is it really a relationship worth keeping? And your best friend? Time to look at how your really feel about her. Are you mutually offering each other just physical relief or do you really, really like her and are just keeping the “friends” part because you are too scared or worried about how it would change your current relationship if you make the leap from friends to couple. I do say that someone (if not several someones) are going to end up hurt. But step back and take an honest look at yourself and how you feel about each person and what you want. Better to break now with a little hurt than have people hanging on to a futile situation building resentment. And last thing, remember that there are other people involved in this and their feelings and any expectations they have will come into play no matter what you, yourself, actually end up deciding. Whatever the outcome, please remember to be considerate of everyone and try to understand their point of view (even if you are the one ending up hurt!). Good luck!