really love how throughout a lot of smith and jones martha is really skeptical and apprehensive towards ten (+ one of my favorite exchanges between them - "what, people call you 'the doctor'?" "yeah?" "well, i'm not. far as i'm concerned, you've got to earn that title."), not taking everything he says at face value, even doubting the fact he's an alien until over halfway through the episode.. And like. i really truly think the thing that wins her over isn't him kissing her or any of the other insane mixed messages he manages to send, it's this scene here, where he /earns that title/ in her eyes:

(+ david's bit in the commentary, where he says: "[the doctor] has actually sacrificed himself, and - i would say, that that final act of selflessness is what finally, eventually, welds martha to him. [...] and she now returns it. she returns that act of selflessness.")

this is what their relationship is built on. it isn't about martha being the second-best replacement to rose or a rebound or whatever. bc it isn't really about rose. it's about doctor-in-training martha meeting someone (quite literally, "the doctor") whose ideals she aspires to, and doing her best to be the same person to him as he is to everyone else. it's about ten in return admiring her intelligence and inquisitiveness and how she cares for human life, recovering his compassion, letting himself lean on her for support - and then remembering at the most inopportune moments that he's supposed to not need anyone and be on his own forever. And around in their little nightmare loop they go where they save each other over and over until one of them breaks

i've seen ppl look at martha and go "why she does she admire/why is she so in love with ten if he acts like that to her?" or something along those lines and like. it's not just the fact she's in love with him (in fact i'd argue she actively tries to push it aside post-gridlock). it's the fact that she knows he's the kind of person to put everyone else's lives/well-being over his own. she trusts him to save her when she's in trouble even though it's been like two days at most that they've known one another bc she recognizes that same "deep all-encompassing drive to help others" in him. and she also recognizes, much much earlier than him, that he needs someone to save him, especially when he's unwilling to save himself. and yeah for a bit she thinks he returns her feelings and is just playing hard-to-get, but she realizes pretty early on that this probably isn't the case, and i think that realization fully solidifies here:

(this is when she's listening to ten talk abt gallifrey). And idk it might just be me but i think this expression isn't just her empathizing with his loss. it's also guilt, for wanting something from him that he's clearly unable to give when he's wracked with so much grief. (and you see it in the next episode, where tallulah asks if they're together and martha says for certain that they're not, and that he doesn't know about her feelings for him. she keeps everything to herself bc she now knows that when he shut her flirting down at the end of 3x01 it was the genuine reaction of someone who a) isn't interested and b) is scared of getting close with someone else again)

freema described their dynamic as "she's keener than him" and i think about this all the time. martha doesn't really take what ten throws at her. what she does instead is constantly poke holes in his already-failing front of "i will show someone the wonders of the universe so i can ignore what is wrong with me". what she does is stand up and fight him when he tries to go off on his own. what she does is put aside her well-being in favor of helping someone - just like what she saw him do for the people in the hospital when they first met. tldr, that's the doctor and his doctor and rip martha you would've loved who's gonna save u now by rina sawayama