Hailey & Justin TRIAL SEPARATION!

Taking some time apart. Hailey Bieber is “emotionally exhausted” with hubby Justin Bieber's “ongoing stretch of erratic behavior,” says a source — especially as she tries to focus on her $1 billion megasale of beauty brand Rhode and their 10-month-old son, Jack.

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"Justin's a dad now and he needs to get his head straight," says a source.

The 28-year-old “has begged Justin to take some space,” adds the source. “She's clear that it's not a step toward divorce, but just time to regroup somewhere private. If not rehab, somewhere he can go to focus on wellness and self-care.”