is it me?

Em • 🤘🏼📍
So my boyfriend and I live together. Have for 2 years. Been together 3.5 years. We used to have sex all the time. Of course the longer we dated the less and less we did. Well this month has just sucked. Maybe because he's been stressed about passing his EMT test that he's been studying like crazy for (which he passed yesterday 🎉) but we haven't had sex in almost 3 weeks...  that's such a long time for us. 
Part of me feels like it's because I'm not initiating it but it's because I want him to. I want to feel like he wants to, not just doing it because I want to... 
is it just me or am I being dumb? He's probably just been stressed and I'm over thinking it like a crazy person