Take this for what it is worth... I am going to make a few assumptions... and see where it goes.
1) You have been going out for 2 years.
2) This relationship is considered exclusive by both partners.
3) Historically both of you have made an effort to spend time with each other.
4) Historically, you have regularly gone out to movies, dinners, events together.
5) Recently, you are still attempting points 3 and 4, and she is not... either by working when you aren't or not wanting to go out or...
That said... I agree with those who recommend you need to talk. Is she just comfortable with you, or tired of you? Is the relationship not progressing as one would like? I am concerned when anyone dates two years and is not considering a permanent committed relationship (such as marriage) or at least talking seriously about it.
I think the backing off and not calling thing is passive aggressive.
