According to me, you should first try and talk with your friend regarding this. You should tell your best friend about your feelings for his wife. Maybe he can allow you to talk with his wife which can clear your way further.
It might not be love. You may be attracted by her or having a lust on her which is making you believe that you are in love with her. This quite common with most of the peoples.
Last edited by harvey12; 07-09-2012 at 11:10 AM.