Pushkin did not write about it. When a man is not in love, I forgive him to communicate, he is not embarrassed, he is not afraid of rejection (well, this will reject - there are many others not worse), he is calmer and more confident and it is easier for him to make a pleasant impression. And in the beloved in the presence of Himself, the brains are spinning, the heart is ready to open, he is afraid to speak, exaggerates himself, carries ahina, runs away in panic, does not dare to ask, because rejection seems to kill - in the end on the part of the lady the lover behaves ignorantly. And, according to the laws of the good old days, He was more faithful than the lady was cold.