Please help?

Hi, I really really like this girl, I know I am going to sound like a retard, but I have liked her for about almost 3 years now, I told her about six months ago, but she told me she has a boyfriend. I have been trying for the past six months forget her. But I just cant get her out of my mind man!! I think about her every single day?? what should I do?

1) dont ever use the word retard like that, its extremelly offensive to some people.
2) get over it.
I know it'll be hard, and it will take some time,
but just so you know for sure, ask her if you guys have any future
then you'll know whether to get on with your life of not

WELL JUST FIND SOMEONE ELSE OR FIND A WAY TO MAKE HER REGRET NOT CRUSHING ON YOU