This is a very funny question. Your wife should be loved more than a girlfriend for so many reasons. Your wife is your better half, she's one with you. Your wife is your pillar of support, she is the mother of your children, she is the woman that would be with you through thick and thin. She's the woman you pledged forever with before a crowd. She will be your nurse when you are sick, your companion when you are bored, your mother when you need care, your friend when you need a friend, your lover to satisfy you sexually. She is your all in all. Even if she chooses to walk away, it is never an easy decision.

A girlfriend was there before you got married and yes you did love her enough to perhaps marry her or not but a girlfriend cannot serve the role of a wife. She can decide to walk away so easily when she believes she can no longer consider. If you are married, you have no business with keeping a girlfriend as that amounts to infidelity.

Love your wife even the holy book says so not love your girlfriend. Laws accepts your wife but do not recognise a girlfriend, religion also. This is enough to know that you should love wife more.