Boyfriend makes me feel bad?

Not in the way you’d probably think. So basically I’m a very independent person. I like to learn by making my own mistakes. My boyfriend and I work together at a small burger place. I met him at my old job, and we both switched to this job because my mom is our manager and she needed help. Long story short my bf is always doing my job for me, and never lets me do anything myself & I get in trouble cause he does a shit job at it. He’s been a supervisor for a year and I’m in training to be one. I told him to quit doing my shit cause I like doing it myself and I know it’s done right. He insists that he does it because he loves me and he thinks that he does a better job at it because he’s faster (he is faster-but doesn’t do the job well enough). I’m sick of it. It causes arguments and I feel like he just thinks I’m not good enough to do it. I’ve tried talking to him but it goes nowhere. Our relationship outside of work is usually fine. What should I do? I’m just so sick and tired of being told what to do, especially knowing that I do a better job anyways. I’ve been told so by everyone we work with.