I agree. She sounds either depressed or not interested. Maybe there is a way to encourage her to share her interests with you. Maybe it is that you are no longer interested in her. Is she your girlfriend? Fiance? Has she been in a serious committed relationship before? Have you? Would it matter? Try your best to be supportive of her needs. It probably wouldn't be the worst problem to find a guy friend or group of friends you could go out with when she is not around. Maybe they would have some ideas how to involve her in your social life?