Too Tired to Think of a Decent Title...

I'm going to sleep soon.
But anyway.
I hate how I abandon people and lose connections without even meaning to...and I never realize until it's already said and done. This has been killing me lately, especially since one of my closest friends decided to not invite Em and I to her sweet sixteen party. I don't even like parties, but she means a lot to me as a friend, and to know that she invited people she's not even friends with over two people she spent all of last year with...it hurts. I'm not going to lie. I don't think she meant to hurt me or get me angry, but she did anyway. I would not mind going to the party and having a shitty time...just the fact that she cares enough to invite me would be alright. I barely see her anymore because our schedules are so different, but I talk to her whenever I can and...could I really have let this slip through my fingers?
I don't know if I should be upset with her or myself.