Would you feel worried?

My husband has been acting weird lately. He won’t sleep in bed with me lately because he says it’s too hot in our room and in our bed, he rarely wants to have sex. I try everything & he still never wants too. We used to have sex every chance we got, which was usually everyday, and now he only wants to like 3-4 times a month. He hasn’t been as romantic either. but other than this though, his mood is still happy & cheerful. He acts like the same person, just no longer sexually attracted to me? i asked him if there was anything i could do that he would like more and he says no and i’m perfect. So i’m just really confused. He’s still so sweet and kind to me, just more do in a goofy friendly way rather than romantic.