Since u said 'guys', I assume, you're referring to members of both sex. Why do they think like that? When a boy or girl is living a lonely life and there's an entrance of a person of opposite sex, who brings joys and gives company and shares everything, and especially when a person is looking for 'love' in life. That person starts to like that new person, but may be waiting for the right moment to express it, and then suddenly there's a twist in the story and without being able to bear it anymore, comes and shows the frustrations of helplessness. I think, that guy didn't handle it properly and I agree that it was not the right way to ask questions. But I just don't understand when a girl comes and have a very close relationship, and when both are single; is it very unnatural to have some feeling?