How do I get my boyfriend to stop asking me for money?

he has been out of work 4 6wks and plans to start a new job end of the month. he's asked me to pay his rent. I've said no because I can't afford too he says he understands and promised not to asked me again but soon enough he's asked again saying I can't believe you got care at all to help me...
How do I get my boyfriend to stop asking me for money?
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