Male Insanity Syndrome Edit Meaning

1.

The belief that there is a more compatible or desirable woman than one's present girlfriend. The ensuing uncertainty often leads to the eventual demise of the relationship. Taken from the movie, The Tao of Steve.

Male insanity syndrome?

"Ya know, that is just you're with a woman and no matter how cool she is, you're always thinking, 'Maybe I could do a little better or I could trade up somehow."