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Love a person need of 100% of heart
If you love two persons at the same time then love that you can give is only 50% 50%, which is not a prefect love just like a broken heart, broke into two part.
Love a person need to be loyal then only love can be lasting.
Love can be the most wonderful feeling in the world; yet it can just as easily be the hardest, most hurtful and extraordinarily painful feeling one ever experiences.

Friend --> love --> couple --> suffer --> break off
Friend --> love --> couple --> marry --> suffer --> break off