Does an exclusive online relationship nix a new real world relationship?

On the one hand, I believe that virtual relationships are much more speculative than real world ones. The couple won’t necessarily ever meet. So therefore people should be free to engage in new real world relationships.

On the other hand, online relationships can feel as strong as real world relationships. One member of the couple can feel jealous of a real world opportunity for the other half of the couple, even if both know they will almost certainly never meet in the real world.

If you are involved in an intense virtual relationship, does that preclude a new real world relationship?