why does it hurt so bad?

I'm in love again..
i know that it is too early to say but i know that i am...
after 3 months of breaking-up to the father of my daughter here i am again feeling the same thing that i felt before.
i want to suppressed it but as time goes by it grows more and i don't know how long can i hold this feeling.
he came to my life during my lowest point,he makes me happy and he was always there.
he is the reason why i forget all my misery,why inspite of my situation i keep on smiling.
but why does it hurt so bad?
why i have to make him believe that he is not important to me?
why i have to make him feel this way?
i have to focus first and stick to my old plan.
sorry,have to let you go so easy..but i know i already fallen in love with you.