Ludacris' GF Eudoxie -- I'm Still Gonna Marry My Fertile Partner

Ludacris' longtime GF Eudoxie is turning a blind eye to her BF's infidelities that produced a kid ... because she's still determined to marry him.

Sources close to the couple tell TMZ, Eudoxie forgives Luda for impregnating baby mama Tamika Fuller. Luda claims they were on a break when he hooked up with Tamika. Sound familiar, Dwyane?

We're told Eudoxie -- who's been dating Luda since 2009 -- is emotionally hurt, but she too is taking the position they weren't a couple at the time of conception ... even though their Instagram suggests otherwise.