He should make it clear he is no longer interested in dating her exclusively. Other couples may permit certain behaviors in their relationship that some couples would not. A couple may discuss becoming exclusive or the nature of their relationship may indicate that they are exclusive.
Unlike married couples -- or even cohabitating, unmarried couples -- should a boyfriend and girlfriend breakup, there are few -- if any -- financial or familial troubles to navigate. People make this decision because they want commitment and to take the relationship to the next level. The Exclusive Question A couple is exclusive when both parties decide and make a conscious effort to only be in a romantic relationship with each other. Broken Boundaries If a person in the exclusive relationship steps outside the exclusivity by starting any sort of romantic relationship with someone else, the couple is no longer exclusive.