This is exactly why I don't open up to people. What if they don't care about me as much as I thought they did? They to HAVE to show me exactly how much they care about me before I feel confident enough to open up to them.
Beware of the term "best friend" or "soul mate" these are terms a lot of narcissists use to draw you back in, keep you hanging on and to further abuse you without responsibility. Don't you cheat on all your best friends?