These are Martha's thoughts at the end of "The Last of the Time Lords" as she's about to walk out to the TARDIS to leave the Doctor.
*****
Home is where the heart is. Rubbish. Home is where you're comfortable, can breathe easy, can stand to look others in the face, can love without your heart squeezing, threatening to break (and not in a good way). Home is where you can smile without it feeling like a lie.
Home was not in the TARDIS with the Doctor. Martha Jones hadn't dreamt of a home in so long. The sights of mangled bodies and broken houses and people looking blank as slates, hadn't allowed her to hope. And the thought of anything that could be considered a home had been too optimistic.
She stared at the TARDIS that stood outside her parents'. She loved the Doctor, so much. A year of spreading that to others, it hadn't really diminished, it helped sustain her.
But there were nights that the truth shined through. It wasn't enough. The Doctor's trust and faith, it wasn't enough. Those nights let her know, it'd never be the same again, and she'd never be the same.
Martha loved that man and all that she'd been shone, everything she had learnt and seen.
And she hated him too. The things he'd done, the things he encouraged her to do, the things she felt he made her do. What she'd willingly done.
She walked out the house, pausing, maybe just hesitating, and strode towards the TARDIS.
It was over now.