These lines indicate that Justin is most likely in a club or some sort and is close with a girl. Hence the lines “Lips on your neck, We’re never too close now”
Since his debut EP My World came out in 2009, Bieber has been one of the most recognizable names in the world regardless of profession. His ubiquity has long been measured in sales and celebrity, becoming the first artist to crack 10 billion Vevo views, but recently he’s added critical clout to the equation. Starting with Jack Ü’s “Where Are Ü Now?” and continuing with his 2015 album Purpose, he found critical praise for his matured pop sound.
Bieber is telling this girl that the feeling they have together goes both ways, they both have an invested interest in each other & he’s not looking at anybody else she has his attention, He’s letting her know besides the fact he’s interested in her that she could compete with any of the other girls in the club or at the party