I want my boyfriend to pay 100$ in rent weekly
Why do want him to pay $100 weekly?
He said he would pay me 100$ in rent if I did dishes for him. Let's see if he has the guts to take out money out of his pocket.
It is normal when living together to share the rent and to pay what is fair for living together. It is better to discuss this before moving in so everybody knows what is expected.
There is no agreement as such. He has to pay $100.
If he's agreed to pay you $100 a week then I guess it's kind of an agreement. It's good that he's paying his share of rent but it sounds more like you have to do his dishes in return.