My boyfriend is living with me for 4 months, bu he doesn't help me financially. How can I ask him to pay for rent?

Would you ask your boyfriend/girlfriend for paying the rent if he/she is living in your house? I don't know how to tell him but I want him to pay at least the half of the rent :(

My boyfriend is living with me for 4 months, bu he doesn't help me financially. How can I ask him to pay for rent?
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