The problem is hers, not yours. I hope you danced your backside off, and if you happen to encounter her again, smile in her face and dance your backside off even more. If she had a history with him, the fact that it didn't work out was a function of both of them, so if it didn't work out, it's partially her fault (as well as his). Heaven forbid someone actually look in the mirror and grow. You don't forever have "rights" to a person just because you had a thing with them once. If a person you are with now is worthy enough to cause someone from his past to be jealous of your involvement with him now, then that person from the past should have tried harder to make things work in the first place. I believe the term “pee or get off the pot” applies here.
As for some of the other comments, black people have been affectionately calling each other "chocolate" for generations. There have been countless sports nicknames "Chocolate Thunder" (Darryl Dawkins), "Black Magic" (the late great Gayle Sayers, the NFL's best ever running back), heck Washington DC was once referred to as “Chocolate City”. The mock outrage is simply hypocrisy. You have (at least) one child with this man; that's a lifelong connection that means you'll be experiencing their joy and whatever pain (including the pain of racism that they might encounter) for the rest of your life.
If others can't grasp that or have a problem with it, as Eddie Murphy so eloquently put it, they can have a Coke and a smile...
Relationships that last are difficult to find and take real work to maintain. Superficial attention to skin colour is the least of one's troubles as time wears on; eventually the participants must settle down to being regular people, sharing their lives, having arguments, discussing religion, food, bills, movies, politics, and the existential question of how much butter should be put on popcorn and who’s hogging the remote- basically living, loving, and overcoming life's normal obstacles. People "tripping" on your interracial relationship need to worry about their own bidness.
