They tried to rekindle their relationship, but things ended up going sour!
A source inside the San Fernando Valley Japanese restaurant tells TMZ ... the "couple" had an argument while inside the restaurant and Selena left less than 10 minutes into the meal. Justin quickly followed with his head bowed.
According to a photog on scene ... Selena drove home with Justin trailing a few minutes behind. When Justin got to her place ... she denied him entrance at the gate and Bieber drove off.
UPDATE: Selena was then seen a night later leaving Justin's hotel..... So think they're still on???
Dun dun dunnnn