Uh oh ... is Justin Bieber breaking down?!

We spotted Justin and Hailey leaving the gym over the weekend -- Biebs in a literal state of BREAKDOWN; he was almost crying, it appears in our pix. Is the stress of their impending nuptials getting to him? Is he feeling overwhelmed? Seems like it!

September 30 is the big day, so Jailey have to be prepping to jump on a private jet and head to South Caroline soon, where they're scheduled to hold their ceremony at the Montage Resort there. Of course the couple's already legally married, but is there something about the public even that's making him nervous?

Then yesterday, we spotted Hailey driving her pink Lamborghini Urus SUV to the therapist's office. Solo pre-marital counseling? Certainly separate sessions are helpful when a couple is working on issues and we've definitely noticed Hailey and Justin haven't been spending as much time together, to the point where we're wondering if they aren't actually living separately. Is it some kinda spiritual/emotional thing so that they can crave each other and long for each other before the wedding, ensuring fireworks in the bedroom on their wedding night? Or are they having second thoughts or WHAT?!