This is so true. For years my wife couldn't imagine being with a guy she did having feelings for him. She also worried that if she did start a relationship with another man that she might develop feelings for him which could be harm our marriage. However, after she started dating another guy she realized that married sex and boyfriend sex were completely different and that she could enjoy both.
Hubby will do whatever you want just to be able to cum at this point. Make sure he thanks your boyfriend on the way out then licks you til you cum.
"Yes -- it's OK with you? GREAT -- because I already told him I would, and I said that it was really sweet of him to say he'd like to start dating me again and that I'd really like that too. I have a strong feeling that you are really going to like being cuckolded -- and I know that I'm going to really enjoy cuckolding you with him."