In my opinion bud you should tell her how you feel, i wake up every morning with the feeling of "if only".
If only i had of told a certain girl how i felt then maybe me and her would be together, now she is married with another guy and any time i see her with him my heart sinks a little.
This is not saying tho that if you do put it all on the line that your feelings will be returned, you have to weigh up the possibilty of it not going the way you want. Also when feelings like this are made open a friendship can often suffer and sometimes be damaged because of awkwardness and such.
My advice tho is go for it, life is far to short to have regrets and have the "if only" thoughts, love is all about taking chances, be brave and you never know, it could be the start of something special for you.