My boyfriend and I have been dating about a month and he's living with his brother, and they basically split their car. His brother is going to school for a month and is taking the car. Since I live within walking distance to his work I offered to let him stay with me while his brother's gone. I didn't get much of reaction from him one way or the other, so I'm thinking I must have broken a cardinal relationship rule and completely freaked him out. If I did move too fast, how do I fix it?

Withdraw your offer, and see what happens.

Way fast for some, some are living together in a week. We don't know how your relationship developed