Songs that represent a healthy/unhealthy relationship?

Unhealthy

Watching Me - Barcelona

http://www.youtube.com/watch?v=hkeK6Q52I8I

In The Shape Of A Heart - Jackson Browne

http://www.youtube.com/watch?v=arUl7VK_vsY

Healthy

Longer - Dan Fogelberg

http://www.youtube.com/watch?v=5Go6I2_PpBU

The Story Of Your Life - Five For Fighting

http://www.youtube.com/watch?v=9mQEfYZEDrI

This Dance - Five For Fighting

http://www.youtube.com/watch?v=Mjknx4so2b0

Healthy Relationship Songs

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RE:

Songs that represent a healthy/unhealthy relationship?

I'm doing a presentation for school and I need to find a song about a healthy and unhealthy relationship. Can someone help me find one for each please? And it has to be school appropriate. No swearing, excessive violence, or sexual connotations. We get 5 points for keeping it appropriate.

For an Unhealthy one perhaps 'Always A Woman' by Billy Joel, or 'Mean' by Pink, 'Happily Never After' by the Pussycat Dolls, and a few of The Smiths songs, google their lyrics and youll see what I mean

for a healthy one

'How long will I love you' Ellie Goulding, 'Paperweight' By Joshua Radin, 'A Thousand Years' By Christina Perri, 'Friday I'm In Love' by The Cure, 'Love Song' By The Cure.

Single Ladies by Beyonce