The bottom line, IMHO, is are you both in agreement with the current status quo? Are you OK with this arrangement and is your partner? There are lots of couples who stay together under these conditions, but there has to be some mutual understanding and agreement about it. If you or your partner aren't satisfied, then some sort of decision will eventually be made either tacitly (e.g., an affair or break up by another name) or verbally about the future of the relationship.