I have a so-called "friend" who only contacts me when he's single.
But as soon as he meets a new lady, that's the end of texts and emails.
False friends indeed.

That never has cash on him so when its time to pay the bill everyone chips in on the promise he would pay us back...but the thing is...he doesnt. Gets us everytime.

And how often do you call on an old friend, or do you expect them all to chase after you?

Why would one reach out to someone who only wants you around for what youuu can do for them?

Trust me, there is no expectation there. Far from it.

are just a stinky (!) of a friend.

Well, what were you waiting to reach out for? Were you waiting until you could have used a favor from them yourself? Perhaps you just believe should be more important and special to your friends than they should be to you. They should do all work at appeasing your desire for their constant attention.
I can go years without seeing or hearing from the good friends I have made throughout my life. However when I have run into them, it's always big hugs, and shooting the shit back and forth like a day hasn't even passed between us. We all know we have busy lives, and we also all know we can always come to each other in our time of need. The door is always open. I don't need their constant attention, and they don't need mine. What we have is each other's respect, and admiration. That is enough.

Perhaps you are privileged and haven't had the need to ask for these things? Have you made an effort to keep in contact with these friends? By the sound of it I wouldn't want to spend time with you either.

You seem very immature and petty. You're making very negative assumptions about people's intentions.

1) A lot of people I meet through school or work are acquaintances. I reach out to them if I need help for a work-related matter, and they reach out to me as well. There's no expectation that we need to be close friends or hang out regularly with everyone in our professional network. Everyone is busy with their own life. That doesn't mean that we're not on good terms, and can't help each other when the other needs help.

2) Some people are introverted, and don't have many/any close friends. It's not personal: it's just how they are. Be glad that you are close enough to them that they feel they can contact you when they need help. They might be feeling awkward and ashamed about it. Why give them such a hard time?

Unless it's very clear they are only using you and will never return the favour, I say give them the benefit of the doubt. Help if you can, especially when it's not too costly for you. One day, you might be the one needing help.

Spell favour correctly.

Privilege.