Please help me out

Hello people,

I know love is a great pain but interesting. Im experiencing that.
Im loving a guy sincerely but he got committed to his aunt girl.
I knew before itself but still i have fallen in love with him and he too loves me alot than that girl.
But unfortunately he cant marry me because of his family situation and stress. I could not able to forgive him
i love him a lot and im crzy about him.
I want him through out my life but i dont have any option.
what shall i do????????????