bursting out into tears after watching then end of a programme..50 shades of grey

So I'm a huge Buffy The Vampire Slayer fan... I watch them over and over again, anyway... I've just watched the end of season 2 where Buffy has to sacrifice Angel to save the world... seeing how hurt and painful it must be has made me burst into tears...
I couldn't ever imagine having to let my boyfriend go, I never want it to happen! We may fight and argue a hell of a lot but I'd never be able to live without him, he's my everything.
Even thinking about losing Chris is making me cry again.
We've been together nearly 2 months but he's the most important person to me, except for my family of course... he's there for me through everything, he puts up with my shit, my moods and my depressive states I get into and I know it annoys him so much sometimes but he still stands by me.
I love him lots and I always will... it's his birthday today, so yeah happy 24th babe. I love you <3

Anyone heard of these 50 shades of grey books? I want to know what they're all about?!