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Ned Fulmer -- the cofounder of "The Try Guys" who was ousted from the YouTube group after a 2022 cheating scandal -- has separated from his wife, Ariel , after 15 years together ... TMZ has learned.

Sources close to the former couple tell us they are no longer together romantically. We're told they will have an open discussion about where they stand in their relationship on his newly announced podcast, "Rock Bottom," on Wednesday. TMZ.com

The shocking news of their separation comes as TMZ has obtained a new photo of Ned hanging out with a mystery woman at the Zebulon music venue in Los Angeles on Sept. 7.

According to a witness, NF was chatting with this woman -- who is not his wife -- for "a really long time" ... though, there was no noticeable PDA. The eyewitness said i

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