Zookeeper
(noun)- A boyfriend/husband that is far better looking than his girlfriend/wife, because compared to him, she looks like a zoo animal
Example:
Ned: Don't you think Bob could find a way prettier girlfriend than the one he's with?
Ted: Yeah, he's a total zookeeper
Ned: Don't you think Bob could find a way prettier girlfriend than the one he's with?
Ted: Yeah, he's a total zookeeper