Is it weird that my boyfriend is my best friend?

We’ve been dating for almost 3 years now, and it’s not to say that I don’t have other friends, but I feel like my boyfriend is my best friend. I’ve had other best friends before, but they all kind of faded out or the friendship stopped because of something ugly. I’m sure I’m supposed to be best friends with my boyfriend, but is it unhealthy that he’s basically my only best friend?

Edit: I have other friends, it’s just more like class friends in uni or like friends I don’t see all the time but still close with and keep in touch with. I’m just scared it’s unhealthy bc I wouldn’t want to be too dependant on him because he’s my best friend