Blac Chyna is dating another teenager -- pro boxer Devin Haney -- and has been banging him for a good while now ... which might be a surprise to YBN Almighty Jay.
Sources close to the 19-year-old athlete tell us he first hooked up with Chyna 2 to 3 months ago, hitting her up on IG after learning they had the same lawyer. We're told Chyna was into him ... and started seeing him regularly soon after.
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