Ophelia

Is there any more tragic character in the story of Hamlet, than Ophelia?  The poor girl (with a pretty name) suffers, suffers and suffers some more.  Her king has died.  This is her boyfriend's dad so it is something of a family matter for her.  Her brother is leaving but before he leaves he carefully warns her that Hamlet is only trying to get her into the sack.  Her father also tries to warn her off.  And then he dies.
The cruelest thing of all though has to be the whole 'get thee to a nunnery' sequence in Act 3.  In short order, Hamlet:

• denies giving her gifts
• accuses her of dishonesty and unfairness
• tells her "I used to love you once"
• tells her that she never should have trusted that love
• accuses her of being a slut
• curses any future marriage that she'll have
• and finishes by hitting her with a boatload of insults

It's widely believed that Hamlet is only playing at being mad.  "I am but mad north-north west. When the wind is southerly, I know a hawk from a handsaw."  But if he was playing, why hurt poor Ophelia so badly?  He's been hurt by his mother and that's given him a general distrust of women.  But shouldn't his love, Ophelia, be given some benefit of the doubt?  Or is he simply hurt so much that he can't afford to do so?
Or, and this is what read true to me this last time, Hamlet really is losing it.  He isn't simply playing at being mad.  He's got a fingernail grip on sanity.  And in his madness, he's lashing out at just about everyone.  Hamlet's actions at the graveyard can be read in this fashion too.
And then she dies of course, poor thing.  I understand that Ophelia has become something of a metaphor for troubled teen girls.  And indeed, she is a very sympatheic figure.  Adored and then thrown away.  Told not to trust in love by her father and brother.  Suffers close and sudden deaths.  Emotionally run over by Hamlet. 
I know it's Hamlet's tragedy, but Ophelia is really the most tragic of them all.