Hello,
I'm hoping someone can give me some advice, as this is really stressing me out!!

I'm a 23 year old male, I've been with my girlfreind for about two and a half years, we use to have a good sex life, but I would still be initiating it most of the time, and got rejected every now and then. During the past year her drive has gone even lower, if I dont mention it or instigate it she will come on to me once maybe twice a week! When i do instigate it she gets upset and rejects me. This makes me feel really hurt and rejected, we argue about it alot but she never wants to here how I feel and turns it around as if I'm being selfish!
We have a great life together, dinners, movies, bars, clubs and all!! What does this mean, is it a phase? Am I being selfish? If it were up to me I would make love once or more a day with her. This is tearing us apart, and she has no idea how I really feel about it, like I said when I try to let her know how I feel she doesnt want to talk about the subject!