I feel like I might have a mother complex when it comes to my boyfriend.
What about your relationship makes you think you have a mother complex?
I'm always scared that my boyfriend will leave me, so I try to do everything I can for him.
Relationships can be difficult sometimes and it is okay to be scared that he will leave you since he has become your family and you love him. But you should talk about how you are feeling and if he is feeling like you are mothering him too much, you can stop.
I'm afraid to tell him how I feel.
It's normal to feel nervous, but I'm sure that having a discussion with your boyfriend about what you're going through will only strengthen your relationship.