One: The relationship is over but she is always reminded of him… and it is kinda self-explanatory with the chorus
“Can’t let you go, know that I can't get over you, cause everything I see is you and I don't want no substitute Baby I swear it's Déjà vu”
“Don't want to compare nobody to you” hence “I don't want no substitute”
Two: The relationship is on the verge of ending and she wants to hold on it… only because the lyrics:
“Baby I can't go anywhere, without thinkin' that you're there, seems like you're everywhere it's true, Gotta be havin' Déjà vu”
I see 2 scenarios from the lyrics
One: The relationship is over but she is always reminded of him… and it is kinda self-explanatory with the chorus
“Can’t let you go, know that I can't get over you, cause everything I see is you and I don't want no substitute Baby I swear it's Déjà vu” “Don't want to compare nobody to you” hence “I don't want no substitute”
Two: The relationship is on the verge of ending and she wants to hold on it… only because the lyrics:
Yes, no?