Graves and Credence are married, but Graves doesn't talk about him much at MACUSA or bring him to work functions to protect him, basically.

They're happily married but there are all sorts of weird rumors and because Credence is still so shy and halting a lot of people asume it's not a healthy relationship.

Except Newt, because he's studied animal body language for a long time and he can see they're happy together