I will realize you were everything I'm missing
And you tell me you're in love with someone else

from Drake – Sooner Than Later Lyrics on Rap Genius

Meaning

“You don’t know what you have til its gone”-Drake realizes he needs her but when he goes after her, she’s already taken.

He knows that if he keeps going down this path, he’ll realize she’s the one when she’s in love someone else.

Marvin’s room could be considered to be an extention of this line

To help improve the meaning of these lyrics, visit “Sooner Than Later” by Drake Lyrics and leave a comment on the lyrics box