Fan Casting Entitled to Have You in Sort by Tropes

Bob is part of a community, a nationality, a religion, a subculture, or whatever social group. As such Bob feels Alice is obligated to be with him, one way or another. Perhaps, given that they're part of the same social group, she will be a "traitor to their kind" if she does not date or marry within it. Or maybe he just feels that by belonging to the category he "deserves" her more than someone outside it. The former justification often goes hand-in-hand with the latter. If Alice complies, she might even discover that Bob is willing to take his sense of entitlement further still.