Is this why your marriage is in trouble - you torn between 2 women, and can't understand why your wife doesn't love your girlfriend? And I'm not saying that to be mean.
Something like this maybe.
First of all, again let me clarify- my marriage is not in trouble. I love my wife and look forward to most moments with her, and it seems to be the same on her end. I just meant that the concept of marriage is in danger to me, like in my own mind- none of the things that might sustain it mean anything to me anymore.
Once not too long ago, maybe 2 years ago, my wife fought me for an entire week because, when passing sheep in a car, I said, "Whoa that's hot." (they looked like ass-cheeks and fat rolls the way they were huddled together- it was like girl flesh pile). I have a friend from college, a female, that my wife hates with an undying bitterness, because once she saw that girl talking to me while reclining in a sexual pose.
She is an alpha-female, if there is a common understanding of what such a thing is- like she loves status competition and being the dominant woman (not in a sexual way, like in terms of status relationships and attractiveness rating).
But this girl that I have been hanging around with, she is always cool about- usually if I mention a girl's name in conversation, my wife's ears go back, her head dips, her jaw and chest tightens, and I can hear the fangs coming out. It's like lycanthropy. In the case of this girl though, she is always all smiles and encouragement and genuine good will. I even ditched the wife last week on her day off (which is sacred to her and she regularly demands of me my presence throughout the day for all manner of innane recreation), she was cool about it and encouraged me.
It's already a joke between me and my friends, how terrifying and suspicious such behavior is.