For the Doctor, it's always been and it'll always be Rose Tyler.
NO NO NO NO NO THIS IS NOT OKAY IN ANY WAY SHAPE OR FORM. <----I FREAKING CHECKED AND IT LOOKS EXACTLY LIKE A WEDDING RING. AND IT WAS ROSE GOLD. ROSE GOLD FOR THE DOCTORS ROSE TYLER. CAN YOU HEAR THAT SOUND. ITS THE SOUND OF MY HEART BREAKING.<<<<< WHY DID YOU HAVE TO GO AND DO THAT<<<< WHY DOCTOR WHHHHYYYYYY
Rose Tyler. the only person ever to show compassion to a Dalek