Love life going downhill

Lise
I've been with my boyfriend for about a year and a half. We have an apartment together and we used to have sex all the time. I just turned 20 and he's 26. I don't know whether is because he's getting too comfortable, he's just not into it as often, or he's just not into me. I mean I can survive for a little while without sex regularly. But now it's been a couple months. A girl has needs right?? But what do all of you think? Am I crazy?