@milk
Fun fact: women do want you to feel some jealousy. Sure, too much jealousy is fucked up, and can result in some really fucked up abuse. But women do want to feel like you REALLY want them. Enough that you'd fight so that no other man gets that kind of access to her.
As for this bloke... she doesn't see him as his boyfriend anymore. He's the useful idiot she gets to keep around to pay the bills.
He's a cuck in denial.