love or passion?

What is love? And what is passion? Maybe love couldn't be an eternal thing. Passion,too.

The beginning of the unfaithful relationship has not any vicious intention, but it hurted three people finally. At the end of the movie, Connie supposed if she made a definitely different decision,their life will be changed totally. But, it is too late.

Can we refuse the lure of passion in our insipid life? If you meet real love or an attractive person or a soul mate outside of your marriage,is it a sin to accept it?