Justin & Selena Selena Takes Him Back But There's a Catch ...

Justin Bieber's single days are officially
over ... again ... for now ... 'cause he's
back on with Selena Gomez -- but
TMZ has learned there's one major
catch -- he's gotta stop acting like a d-
bag. According to sources, Selena had
firmly resisted reuniting with Justin
after their most recent breakup
because he and his friends have been
acting like raging self-entitled
jackasses the last few months --
smoking pot, speeding around in
expensive cars, and pissing in mop
buckets.But Justin -- being the
Casanova that he is -- was able to
change her mind ... and on July 4th,
we're told he won her back by
promising to change his douche
ways. Apparently, Selena bought
it.We're told JB and his "Wild Kidz"
goons have taken notice of the public
backlash against their ridiculous
behavior -- hard not to -- and they all
decided to clean up their acts.Sounds
like BS -- considering Bieber's abysmal
track record for making phony
apologies and continuing to act like
an oblivious self-important douche-
baby -- but our sources say Selena
has always been an extremely positive
influence on him ... and if anyone can
change him, it's her. You'll notice --
Bieber's string of crappy behavior has
almost perfectly coincided with him
being single. Whenever he was with
Selena, however, Bieber seems to
retire his crown as Douche King, the
Supreme and Unapologetic Leader of
Doucheland, and act like a semi-
gentleman.Bottom line, it seems like
no one else can fix Justin, so why not
give Selena a shot? It might just be
crazy enough to work.