Why didn't she just give him a firm, but polite "I'm not interested"?
I'm not saying that stalking and/or harassment are acceptable. I'm just saying that she probably could have avoided 14 years of misery if she had just politely told the guy that there was no potential for anything more.
Women need to learn to reject people in whom they're not interested. They think they're being "nice" or at the very least, being "not mean" but they are being incredibly cruel by letting the other person think there's hope when there isn't.
Don't expect him to take the hint. Tell him directly.