May I ask, does being in love need a reason why I love that person? If yes, is it a must to tell the reason? Because I thought love can't be measured.

In my opinion "IF" you love someone there is no one reason why you love them. Love is something that you can't explain why or how you just do. Once you are in love you don't ever question that you do.

Love sometimes means doing the right thing for you and the other person even when it's hard. Even when it almost looks un-loving at the time.