having a hard time

so, my boyfriend and i usually have amazing sex and i have mindblowing orgasms within 2 minutes of riding him, but lately having sex seems to be pretty rare due to his long 12-hour work days combined with his job being pretty annoying, and even when we have had sex i haven’t been able to cum at all. my sex drive is through the roof basically always, but i’m wondering why i’m having a hard time getting orgasms the past few times we’ve had sex. sex is still really fun with him and i love getting that kind of physical affection and love from him and giving it to him in return too, but he’s the only person who has ever made me cum during sex so i’m confused as to why it’s suddenly so hard.