have you read/watch the story of romeo and juliet about there undying love for each other ..
I have read about it and may be just may be its the reason why I believe in fairy tails because the story its self will really make make you believe about it about true love and they might not live together in the end because it really is a tragic ending but still the both of the are so willing to die for each other..
their love so pure and bond so strong that both of them are will to follow each till death