"Faking emotions one doesn't really feel" is not why calibrating one's approach to eye-contact can be beneficial - in fact, these two things have basically nothing to do with one another! If anything, it's helpful to be able to conceal one's emotions before mutual attraction has been clearly established, lest an excessively overt emotional state be reinterpreted as aggression. (You know how people tell you not to make eye contact towards an aggressive dog, because the dog would see that as a challenge for dominance? Well, the relevant social instincts are still fairly active, even in humans. And yes, they can lead to unwanted screwups when you're meeting someone, e.g. for dating!)