Because love needs challenges to stand firm , to be molded strong so that in a relationship it will last long... 
thanks.but,why someone still doing marterity? even if its too much pain
because they love that person so is blind
we do have respect in ourselves i guess thats more than enough.
real loves allow you to show who you really are, your attitudes and everything in you.. they didn't told you to love to change person attitude right? they told you to love , to love who he/she really is and everything in her/him.