You know that’s ridiculous right? Did your boyfriend make this thread? Even if that was the true origin of the word cracker, slave masters were never the ones oppressed in that dynamic. As per my previous comment, this word has no power. Overtly said in jest, a non racist wouldn’t give a rats ass. Especially between significant others and between friends. 

Unless you are black yourself, and called your white boyfriend a cracker, that’s a dynamic I’m not going to touch upon.