Ok so I think I remember this guy's perspective: When he meets a girl for the first time and becomes friends with her, not too much time elapses before he decides for himself if he wants to remain just friends or pursue something more. Let's say he decides to pursue it, and she is NOT responsive, he basically feels the moment has passed. He continues to remain just friends with her. Only, what if later she starts to have feelings? See what I'm saying?

I think it depends on what the guy's objective is. There are some guys I know that pursue purely platonic friendships with a great amount of girls, with no intention to date them. Others see every girl as a potential relationship and so when the girl doesn't respond, he is on to the next. Make sense? I guess it really depends on the way you do things.