What the hell?!?!?!

I feel absolutely horrible. My best friend basically doesn't give a rats butt about me, and obviously doesn't care about me at all. Should I feel bad about that? I think I should, but some people don't think I should. I feel abandonded and left out to dry. He acts like he doesn't care that I'm upset. He just doesn't understand that I really care about him. I mean this isn't a I love you , I wanna marry you thing; This is a "You mean so much to mean and I will Love you unconditionally forever, and you can't do anything that will waiver that love." someone who means so much to me, appears to care so little about me. And that upsets me to no end!