So there's three AFC East fans in a bar talking about their girlfriends; a Bills fan, a Dolphins fan, and a Patriots fan. Women don't like Jets fans, so they had no representation in this joke.
The Bills fan started talking about his girlfriend. "She's kinda overweight, and difficult, but man, can that woman cook!"
"Gotta love that in a woman," said the Dolphins fan. "My girlfriend is a gorgeous blonde, and she's fun, but she's completely crazy. I never really know when she's going to completely lose it."
"I really can't complain about my girlfriend," said the Patriots fan. "She's beautiful, she cooks for me, she's smart, and she sleeps around."
The Dolphins fan and Bills fan stared at him. "Wait...she sleeps around? And you're okay with that?"
"Hey, I'm a Patriots fan," he replied. "You really I think I care about cheating?"