Do I Break Up With The Sweetest Guy? Am I Making A Mistake?

I (22F) have been in a relationship with my boyfriend (23M) for the past year and a few months. We met in elementary school and I had a crush on him for almost 5 years until later into high school. After graduating, he began messaging me and the excitement of someone who I had been fond of for so many years in the past caused me to rush into a relationship (I had just gotten out of an insanely toxic 4 year relationship a few months prior). We started dating and soon I realized he was completely inexperienced, and he ended up telling me I was his first everything.

First kiss, hand hold, body, all of that I was his first everything. Being a sort of avoidant attachment style, I jumped at the constant dopamine I’d get hanging out with this guy. Daydreaming about how proud my younger self must’ve been.

Now a year later, I’ve found myself considering cheating on him. To no fault of his at all, he’s the most perfect patient and sweet boy, he doesn’t even drink or smoke and refuses to raise his voice or let his emotions control him. Along with having an insanely well paying job due to his degree. Now why or how could I ever consider cheating? Honestly I don’t know really but I think he’s just not my type maybe? I’ve always been into guys who were leaner and taller along with being artistic/creative in some form. My boyfriend though? He’s big and muscular(not like chubby big but like mid bulking phase big), barely an inch or two taller than me, and is not interested in art at all unless it’s drawing anime girls and sometimes guy characters.

I’ve also always been a drinker and a smoker, but since I’ve been with him I’ve been sober for practically the whole time. Not a bad thing at all but it’s not completely my choice, as he’s extremely against it. Saying that if I did end up drinking or smoking he’d have to start learning on how he can cope w it. (His family has some trauma around booze). And listen this isn’t one of the bigger “issues” honestly I’d give up substances completely if it were the right person and they wanted me to, but I’m almost out of college and I want to experience more party life, sounds terrible but it’s true.

Although at the end of the day I somehow come to care more about how he feels than how I feel and am starting to consider just staying in the relationship to comfort him. Would it be better if I stayed or left?

TL;DR: lustful girlfriend wants to know if she should stay with her perfect boyfriend with a 2 incher or break up with him