They are possessive because they want your wallet. They are clingy because they want your wallet.
They are needy because they want your wallet.

One good way to avoid that is not repeating too often with them. Once they feel comfortable with you they tend to push the limits. You should also try to keep a distance when it comes to emails, texts or calls when you are not booking with them.  

If you have sucker tattooed across your forehead I would suggest getting it removed.

You obviously have the best dick they've ever had and want you to please them as much as possible

I wish providers were emailing me all the time wanting me to fuck them.  

Wow. I hear about providers who do that but it just seems so unprofessional. I hesitate to even message them from TER out of the blue. I imagine most reputable providers feel the same. I don't contact anyone unless I am responding to an email they sent me or I am wishing them a happy holiday of some sort. I'm sorry you're dealing with that, but AnnaFaire has a very good point.

you're probably a real sweetheart... it's hard not to care for people when you have a genuine rational soul- it doesn't make you a sucker. try hard not to harden yourself to the needs and feelings of others. try to find some balance so that you don't let them suck you into their drama.
i know that is somewhat rambling, but.... i'm a bit of a realistic dream

what type of providers are you seeing bec most chics I know could crack walnuts with their balls