Bernie: Chris, you're not bringing your wife along? Are you?
Marty: Yeah, Chris, guys' night out!
Chris: Well, that was her condition for agreeing. I hoped you wouldn't mind. 
Bernie: No, ofc, not. Bring your mistress along as well. 
Marty: Yeah! Catfight!
Chris: Oh guys, c'mon! I really wanna come!
Chris is bringing his wife along. Otherwise she won't let him come.