These expressions come out in romantic mood and it has nothing to do with the truth or false. It is the way to say how important she is.Similar quotes are:
Your face is as beautiful as moon, I would live with you on your conditions, your eyes are like lakes etc. :laugh:
In today's world I could only say that these words are used casually by a lover as he or she doesn't mean it. It is very often found that these words seems to escape out from the windows when it comes about proving them. Hence, I would suggest the present generation guys use your heart but also don't forget to use your head in matters of today's love!!!
Maybe what isha have told feels us to believe that love is more than life but that is instantaneous action without proper thinking. They feel that life is very cheap than love but never think that how that life came into existence and after their death they are not going to achieve either this love or anything.
I dont think it is wise decision to take ones life just to attain love from one person. :unsure: