Poor Justin! Bieber was in a MOOD Thursday as he returned to LA following a brief "spiritual retreat" to cleanse himself and reset following ex Selena Gomez's release of the single "Lose You To Love Me" which basically SHADES Justin for making their former relationship unhealthy. Ouch!

Justin's admitted his failings and foibles and has tried to atone for them, but Selena's not giving up -- she wanted to tell the world HER side of the story and, in fact, she's said in interviews that she hopes Justin listens to her song and knows it's about him. Uh ... we think he knows!

We spotted JB in his newly-repainted pearl white Lamborghini Urus SUV heading to a therapy session, on Thursday; and in the parking garage, he was greeted escorted in by his bodyguard who he hugged before going into session. Awww!

We just hope Selena's new single doesn't put Justin into a tailspin -- obviously he struggles with depression and anxiety, as he's admitted publicly, and this could be a tough pill to swallow. Instead of finding refuge in his wife Hailey, he seems to be trying to deal with this on his own. Is that the best way?