She has said repeatedly that she and Justin will always be friends. Exes can hang out.
Plus she went black, not a even a Legend like herself can go back
Taylor: "Girl whats wrong?"
Selena: "My man aint ****"
Demi: "Girl whats wrong"
Selena: "My man aint ****"
T&D: "Girl whats wrong"
Selena: My man aint ****
t&d: "Then why wont you leave him?"
Selena: "cause bitch, dick too bomb"