I agree to perpetuallysad's point of view. This might be the case with the person. But there can be other possibilities. The funny thing with behaviours and attitudes is that you cannot be definite or certain even if you feel like it, as these are the marks of waves on sand and change with every tide. If we complain or try to make the other person realise that he/she was mean or selfish or any other ill-motive, he/she will reply that you felt this way, I am clean and all right, it is only uor self created weired feeling.
So I have learnt ( still learning as new lesson in a new way) that it is better to either scrutinize or filter these people using my past experiences or do the favour to them just for the sake of nothing and not to expect anything in return.

Regards
ZILCH HOUR