@ippn1,
Two points I can make. First, I don't think you are wrong for feeling a bit hurt that she would give up spending time alone with you in order to wait for her gf who has been gone for 14 days.
But, you seem to be putting a great deal of emphasis on sex and her giving you sex. Nowhere do I read that you love her. You give the impression you want her around for sex. Now, admittedly, I could be reading more into this than there is, but this is how it is hitting me at this moment. Maybe she feels you are always wanting sex and not just wanting to be with her.
Why didn't you suggest going home with her to wait around for her gf with her? Or did you not think of that because it would not have led to sex? See what I mean?
Is it more important to you to have sex with her or to just spend time with her? Answer that question and then you may know what to do about the relationship.
(I am not trying to minimize the importance of sex within a relationship. It is important. But it is not the most important thing. In my humble opinion.)