Justin to Selena It's Not My Fault ... You Drink Like a Fish

2/7/2014 6:00 PM PST BY TMZ STAFF

Selena Gomez didn't go to rehab because she couldn't handle loving Justin Bieber -- she went because she's a world class lightweight ... at least that's JB's side of the story.

Sounds like that on-off thing they have ... is definitely OFF. Again.