Sources close to Christina tell us there's absolutely zero chance Christina will get back with Tarek because she's fully turned the page. She'll remain friendly for the sake of their 2 kids and hit show, "Flip or Flop" -- but that's it.

We're told Christina's still dating the contractor who offered her a shoulder to cry on back in May, Gary Anderson -- but even if she weren't, she's beyond the point of ever getting back with Tarek.

As for last week's awkward meet-up at Starbucks -- we're told that's just what co-parenting looks like for Tarek and Christina ... especially since they hand off the kids every week.

As we told you last week ... a source close to the former couple told us they hadn't quite thrown in the towel. Our Christina source wouldn't speak for Tarek, but told us Christina's definitely NOT leaving a light on for her ex.