No sex = frustrated boyfriend

Mak

Hello so I don’t know what to do my bf and I have been dating for almost three years and we never have sex and that’s due to me because I just am never horny. Idk if it’s because I’m constantly busy with school and work and homework and studying or what but it definitely takes a toll on our relationship. Any advice or tips?? I don’t know what to do anymore but I feel like it’s going to tear us apart if something doesn’t change.