Hmm.. in my opinion, i think its more likely the other way
round.
When you're sad, who is the one you wanna share your
problems/sorrows with? And that is the person you wish to be.
You can share your happiness with everyone but not your
sorrows.
Well, actually both way makes senses. haha. *puzzled*
Like fireice said, the one that makes you happy may also be the one
that makes you sad. so its more to chemistry!