[znt]

Recruiter's priority is to get you to sign a contract so he can take his cut.

This may not align with your best interests as he can make you a lower offer than you aim for, if you reveal your past salary information.

[abannin]

The problem here isn't that you disclosed your current salary, it's that your 'must have' salary is too low. Tell your recruiter "I need $x minimum", and they will get you $x or not work with you.