Originally Posted by btowntriad
Just this past weekend, I allowed the two of them to be alone together and afterwards, my wife allowed us to be alone.
I think if you want this to work as a relationship, you will have to stop thinking of yourselves as a couple plus one, where the couple makes all the rules. That sounds very swingerish.
There are three individuals involved here, and four relationships: you and your wife, your wife and your girlfriend, your girlfriend and you, and all three of you together. Are you saying you are not sure how to talk to your wife about wanting more alone time with the girlfriend? You all need to sit down and discuss what each of you want. Be clear and honest about it, and sensitive to each other's feelings. Remember that there are three whole people here, not a unit of two and an additional one.