Caught My Husband With His Boss

Woke up late, my husband was already out for his night shift. Came home at 4 AM to find him and his boss fucking on the couch. She's in her mid-thirties, blonde hair, tight body. He confessed it happened a few times while I worked nights. Felt like crap but they both said they'd stop if that's what I wanted. Don't know yet if I want them to end it or continue this weird open arrangement. It’s not my fantasy, but he’s happy and she gets something too.