i say love is the hardest there is no one perticular thing.....

love is hardest and painful no matter how sweet it may be but keeping the love alive is the most hardest the fear of loosing a loved one by a misunderstanding that is hardest....trying to keep the trust between eachother that is hardest,love is the most difficult.....but indeed very sweet 

Life is a mystery..... you never know whats next.....