Why is it like this?

I'm the kind of girl that's always laughing and stuff never gets me down
But things got kind of different everytime you were around
Yes indeed i liked you
But there was nothing i could do
For you didn't have feelings for me
You were in love with her as clearly I could see
You talked about your feelings for her and I acted as if I didn't care
But I'm the one offering my heart..you're just not being fair
You've said some mean things to me that have really broke my heart
I said I'd never shed a tear over you...but you tore my heart apart
And now that's my only option for that's the way you make me feel
You don't even notice me shes got so head over heels
I cry myself to sleep at night when I think of what could be
But you won't even give me a chance..why won't you see
Why does it have to be like this...I guess you're the only one who knows
I guess I'll have to get over it...cause that's just how it goes
So when you're with her and she breaks your heart
Just remember it was me who was offering my heart to you from the start