I'm sorry that happens to you, too. I've experienced those people, those users. That's not friendship. Friendship usually starts slowly. When people are thrown together due to someone's need, often the one needed gets thrown aside after. If you give, it doesn't mean that you get. This is common for women when men want "only one thing." Seems like you need to use smalltalk, too, to gauge people over time and decide who is a friend, who behaves reciprocally. Friends are hard to find. I have had only one, really. And even though he didn't require lots of totally trivial small talk, it did take time to see if we would be friends.