WHAT SHOULD I FEEL? BE HURT? NOT CARE?

You have every right to be hurt! Just as long as you aren't bawling your eyes out and you aren't angrey at them or whatever. It's okay to be a little disappointed. I would be. But then again, you may just have forgetful friends. Keep reminding them of these things and see if they remember. If you start to feel as if they are just using you, talk to them about how you feel. It may seem very awkward and embarrassing (maybe even rude) at first, but if you tell them how silly you feel for feeling this way, they will understand. You can laugh at yourself after. It really isn't that big of a deal. Good luck! :)