Do guys pretend to be players when they are not?

There has been one or two guys I've come across that make me wonder this because they are inconsistent. I can't tell if he is a nice guy but wants to seem like a player, or if he is a player posing as a nice guy. Do guys ever hide being nice because they feel 'nice guys finish last'? Honestly? Especially early in things when its still in that "does she/he like me too" stage? And does this change if the girl is a girl that appears to get a lot of attention from men?
Do guys pretend to be players when they are not?
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