8 year relationship at the brisk of an end

So i was in a relationship with a guy since i was 13. I am 21 now. But after almost 8 years of being together i feel like we are drifting apart and that he doesn't really love me. I know i sound stupid like how come after all these years she's saying now that he doesn't love her. But i feel it. He's always busy and gives me excuses for not giving me time. It seems like I'm the only one making a real effort in our relationship. We are both medical students so i get it studies have a hard toll on us but still relationships should be given a priority right? I mean I'm in the same situation and i still find time then why can't he? I really don't know if i should just end things cause I can't even imagine marrying a person if i have no value in his life. Please guide me. I'm at a loss of words rn. Should i just end things? I tried a multiple times to communicate with him and tell him how iam feeling but things don't change.