He's fixating on you. He's “doing" you in every way he can come up with. He will keep doing it until he leaves. He sees your kindess and need for income as your weakness. He knows he CAN do you because you want the money. As soon as you don't want the money and tell him no he will leave and start on the next one.

It's not about YOU. He knows you are married. It's about him being able to DO you. The thrill is in the chase.

Tell him to stop it and he will but he will leave too. You can't have the income and the parent behaving himself. He won't do both.