Home Sweet Home - Motley Crue (not so sad I guess but reminds me of my sis and makes me cry)
Every Rose has its thorn - Poison
Bright eyes from watership down makes me well up too!
It's not a love song but "Old Brown Dog" by Ralph McTell makes me cry. It's mawkish and sentimental but it gets me every time.
Oh and "Everybody Hurts" of course!
How do you mend a broken heart? - Al Green
Love on the Rocks - Neil Diamond
The Scientist - Coldplay
Crazy English Summer - Faithless
Fix You - Coldplay