How can I win her back?

After my wife of many years died of cancer my best friend and his wife supported me.

Then he dropped dead with a heart attack and his wife discovered he had been having an affair.

I found a purpose in life in supporting her. We became good companions and also lovers.

But when she went on a holiday alone recently she fell for a divorced man. She has finished our relationship but wants to remain friends.

I had not told her I loved her as I felt I would be betraying my love for my wife. Now that she knows, she is confused and uncertain what to do.

If I have lost her how can I win her back or is she simply trying to let me down gradually?