Ne-Yo Not Back With Ex-Wife Crystal After Affair Despite Public Appearance

Ne-Yo is NOT back with his ex-wife Crystal Renay despite their recent public outing together ... we're told things are strictly professional, and the two are cordial.

Here's the deal ... Ne-Yo and Crystal raised eyebrows this week when they were both on hand for a public appearance at the opening of their restaurant chain's newest location, prompting speculation they had reconciled after an affair that wrecked their marriage.

Sources familiar with the situation tell TMZ ... Ne-Yo and Crystal are definitely not back together and they were both at the restaurant opening because they are co-owners and it's in their contracts.

We're told Ne-Yo and Crystal are both dating and seeing other people ... as well as co-parenting their three children.

TMZ broke the story ... Crystal divorced Ne-Yo last year after he had a child with another woman.

Our sources say Ne-Yo has a certain amount of appearances he has to make for the restaurant chain they share, Johnny's Chicken and Waffles, and Crystal is heavily involved in the business' day-to-day operations ... which is why they were both at the grand opening in midtown Atlanta.