Sex Drive Plummeted /rant/

My sex drive has always been high/average - even in my relationship with my fiancé of about 4 years. Recently (meaning like… the last idk 6 MONTHS!!!) my sex drive has plunged into nothingness lol. I feel bad because my fiancé has brought up that he feels neglected by me pushing sex away but the last time we had sex (about a week ago or so) I genuinely… didn’t want it but did it anyway for him. I was DRY like I WANTED to enjoy it but I couldn’t get out of my own head. I’m not sure what happened or changed - however here is my “argument”, I am an elementary teacher full time, a graduate student full time, have dance classes three times a week, do homework, make meals - like I don’t even have a spot in my brain that could FIT sex lol. My fiancé however, just works. He works full time so I don’t mean to put him down but he is a manager at a well known coffee shop… didn’t finish college… doesn’t really plan on finishing college… no exercise or even like group activities… just goes home and sits on his phone. He complains about having “undiagnosed adhd” and that’s why he struggles with finishing his degree but won’t see a doctor, therapist or anything even when I offer to help. I don’t mean to compare apples to oranges but I feel like my basket is heavier than his and unfortunately maybe that’s turning me off? I think I dislike his lack of drive to better HIMSELF?

Also probably unrelated but you never know, I just started taking adderall about a month and a half ago and really noticed wanting nothing to do with sex. I haven’t really seen anything related but maybe others experienced something similar?

Thanks for letting me yell lol.