Wow. I've studied the book of Ruth several times, but never with that exact interpretation. The pastor or teacher usually focused on the lessons of faith and the family -- both important lessons, of course, but since I'm starting college this Fall the dating approach really struck home. Now I know what evidence to use when I'm giving my friends some dating-advice.
On a side note:
Mustardseed, you said that teens these days fall in love too easily.
No offense, but allow me to change your wording a little. I just graduated high school, so I've been around a lot of that lately.
"Teens these days fall too easily."
That's really all there is to it. If they're falling into anything, it's lust, or just the drive to be popular, or to have fun. It's a real shame.
To tie it back: More young people should read the book of Ruth, and really analyze it. It would solve a lot of dating problems.