The Doctor’s extraordinary, unique, amazingly wonderful, and oh, he opens Martha’s eyes to things she’d never have dreamed existed, even in her wildest imaginings. It doesn’t matter that he’s an alien; she can’t help but fall in love with him. When he kisses her, out of the blue, her heart beats faster and her knees go weak, and it’s the most incredible feeling.
He invites her to travel with him; she jumps at the chance, because love makes you do crazy things.
But the Doctor’s in love with someone else and her heart breaks a little. He’ll never be hers.