My boyfriend didn’t want to have sex because he was cold and that worries me

18f have a boyfriend 18m, I was at his house and his heating is broken, not completely but it will knock itself off then he has to go outside to do something with this box to get it back on.

He came back inside after doing that and I try coming on to him and he said give it a bit for the heating to come on because it’s absolutely freezing.

It was very very cold but it didn’t bother me enough and that really surprised me because normally he’s never actually said no to any advance I made. Sure we did actually have sex like 15 minutes later but it really worried me because isn’t this a sign he’s not as enthusiastic about sex? We were both virgins before each other and it still feels just as exciting to me.