boyfriend doesn’t want to have sex w me

i know my boyfriend has a low sex drive and i have a high sex drive but sometimes i feel like he makes up excuses for why we can’t have sex and then we go two or three weeks without sex. sometimes i’ll tell him that i want his dick and all he says is “i know babe” or i’ll tell him how i’m excited to have sex next and he says “i know babe” instead of expressing how he wants to have sex w me too.