Perhaps it is just time for you to move on. As painful as it is for you it is probably just as awkward for her. It makes her feel uncomfortable around you, understandably. Its obvious she doesn't want a romantic connection. As much as it hurts now you are only creating problems for yourself and for her.
You need to move on with your life. Nothing good can come pursuing this any further.
Don't let your anger get the better of you. Don't let your emotions rule you. because in the end it will ruin you.