Wow, this would make my head spin. You've spent a whole year getting over this and have finally found peace and closure. I don't know how many years you spent together, but if this is the third time he's abandoned you I would think it's been some time. This is a no-brainer...how much more of your life do you want to waste on this? We all have a limited time here on this earth to find happiness, our clocks are ticking. It seems to me he had his chance and blew it.
My humble opinion? Delete! Now go find Mr. Right and be happy!