And nobody's goin' to know if it's true
He fears being rejected by her, in my opinion, so he disguises his true feelings for her, after revealing them, by implying that he’s only saying them to get her into bed. Although, I am pretty sure he does has love for this girl, it could be just his pick-up routine.
The line “nobody’s going to know if its true”, refers to the fact that hes been cheating and Valerie knows. So even though he says the words, “I love you, and I need you, I only want you”, NEITHER he or Valerie know if he really means those words— because when you actually love, need, and want someone your actions reflect that.
To help improve the meaning of these lyrics, visit "Valerie" by The Weeknd Lyrics and leave a comment on the lyrics box