My relationship doesn’t fulfill me i cheated instead of breaking up

I’ve been trying to understand why I don’t feel fulfilled in my relationship, and I think it’s because several important needs aren’t being met.
On a practical level, I feel like I’m carrying the mental load. I worry about money because my partner struggles with budgeting and financial responsibility. I find myself wanting to manage everything. But he wants to be in control because he wants to be a provider. I wish it could feel like we’re a team, I feel like I have to supervise or direct things, which leaves me feeling resentful.
Emotionally, I don’t feel deeply connected. I cant show negative emotion infront of him because he will feel the emotion more than me then i have to comfort him instead. I normally go to the bathroom to cry alone then come out after. I appreciate that he gives me stability and cares about me, but I don’t feel understood, inspired, or emotionally excited in the relationship. Over time, resentment has replaced a lot of the affection I used to feel.
Our sex life is also a major source of dissatisfaction. I never feel sexually fulfilled, and I always leave intimate moments feeling frustrated rather than satisfied. I told him what i enjoy in bed but every day it is the same thing he kisses me then does me in missionary and gets off after about 5-10 minutes saying “i’m so tired”my needs are not being understood or prioritized. sex has become something I think about with disappointment instead of excitement. It’s not just about physical pleasure it’s about feeling desired, listened to, and connected.
I went on a date with another guy but I didn’t have fun. I flirt with other guys some just for fun because i feel so disconnected from the relationship. My partner just feels like a safe option, i don’t know what to do. His friends are visiting the apartment saturday. I will have to hold back my thoughts until after then. It’s so hard because one of his friends knows how i feel about the relationship he sided with me on it surprisingly but he told me to remember this is his friends first ever relationship(it’s my third serious relationship)