no sex.. not even on anniversary

So my SO has been well.. Less sexually active with me , we've always been obsessed with eachother and I'm not kidding having sex 3-4 times a week it's never got boring that's the normal for us, I only see him 3 nights a week too as I hold two jobs down. But lately over the past three weeks he's not bothered as much.. Like he's been very distant and barely touches me even sexually or romantically. We've had sex like 1 time a week the first day he's sees me too /: it's like he's doing it for his needs and then stopping. I could be stood naked in the hottest underwear and he'd not care if we already had sex that week.. Today's our 2nd anniversary and he didn't bother once , barely even cuddled me and left after an hour and half.. We're both 19 and this is so weird and it's making me feel like something's wrong with me, but I don't dare bring it up to him because of sounding silly but it is affecting me