Top Reasons why I love River Song → She gave her life to save his. 

RIVER: Funny thing is, this means you’ve always known how I was going to die. All the time we’ve been together, you knew I was coming here. The last time I saw you, the real you, the future you, I mean - you turned up on my doorstep, with a new haircut and a suit. You took me to Darillium to see the singing towers. Oh, what a night that was! The towers sang, and you cried. You wouldn’t tell me why, but I suppose you knew it was time. My time. Time to come to the Library. You even gave me your screwdriver - that should’ve been a clue—- There’s nothing you can do.
THE DOCTOR: Let me do this!
RIVER: If you die here it’ll mean I’ve never met you. 
THE DOCTOR: Time can be rewritten.
RIVER: Not those times. Not one line, DONT’ YOU DARE. It’s okay. It’s okay, it’s not over for you. You’ll see me again. You’ve got all of that to come. You and me, time and space. You watch us run.