Selena Gomez is going for nature therapy following her stint in an east-coast treatment center for "mental issues." Friday she was out communing with nature and with friends on a hike -- hey, nature does a body good!

While Selena's enjoying her time back in LA, her ex Justin Bieber just hopped a private jet and left town with wife Hailey Baldwin and we have a feeling it's better if they're not in town at the same time. Could they each be the cause of the other's psychosis? Justin's been suffering from what appear to be anxiety attacks and we can only imagine that maybe these two don't need to be communicating with each other. So we asked ... have Selena and Justin been talking???