Me versus my boyfriend vs my mother

I get told to " not have sex to not take my clothes off" when I go see my boyfriend. Yet a month ago, I had sex my mom freaked out. Then now (a month later) my mom's still worried about my boyfriend not respecting me. All I want to do is see my boyfriend that's it. The one weekend I have off and just go hangout with him at his place. Now I can't because he's freaking out about gas money and going back and forth to see me. Mind you I'm 21 and I live in my moms house. I don't know what to do?