Why are we so confusing?

My boyfriend once explained his theory that opposite sex friendships are not without some form of inappropriate attraction. Now despite him saying he had no interest in adding any female friends on... say Monday, by Tuesday he has added new female friends. I normally would not put much thought into this but with his viewpoint being what it had been for a few years to flipping overnight and knowing he would blow gasket if I did the same; should I be asking any questions or just let him be with his change of heart (knowing I cannot have male friends).

Why are we so confusing?
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