How am I responsible for his housing situation?

I recently moved over a month ago and my boyfriend is already assuming we would be living together. I told him after were exclusive and committed its a possibility we can live together, but he needed to get his own place because I can't house him unless he has a steady stable income which he does , vut he doesn't have responsibilities like I do by paying bills and running a household. He focuses on gas for his truck , take out food , and his cell phone. I'm not ready to give up my space for him living wise , but don't mind him staying sometimes. Pretty soon I'll be running my business and homeschooling my kids. Since telling him this a few days ago I haven't heard from him since then.
How am I responsible for his housing situation?
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