He doesn't want her, but he doesn't want anyone else to have her?
That seems a little selfish and controlling, don't you think? I mean it's been three years... he's had more than enough time to get over her. Probably do him some good for her to be with someone else -- help him to move on.
"The weakest soul, knowing its own weakness, and believing this truth that strength can only be developed by effort and practice, will, thus believing, at once begin to exert itself, and, adding effort to effort, patience to patience, and strength to strength, will never cease to develop, and will at last grow divinely strong."
- James Allen