Maynie,

Don't beat yourself up. I don't think you are being selfish at all. Sometimes it is important to have just two people. There are things you and your sister ned to talk about that do not pertain to the boyfriend. If he is a reasonable guy he will understand. He probably doesn't want to hear all the "girl talk" anyway. I know I wouldn't. Call her and ask her to come without him, and tell her that you can meet him next time. Good luck!

bfG