sorry, i didnt read the whole story but i had a quick read.

1. the moment you asked the question "stay or walk away", you have subconsciously want to walk away but you just need people to reassure your decision and normally subconscious will not lie because that is your mind wants. so if the question arises, just walk away. If you do not feel like walk away, you will never have this question before. Just like when you are full, you wont ask yourself if i want to eat or not.

2. All those caring things she did, like asking your wellbeing, share picture of the lunch/dinner she ate, in a relationship, those gestures are just sub-point, not a main point, so in shorts, it means nothing. it is just something people do when in r/s but enough to justify whether to stay or to walk away. i was in your position before where we greeted good morning every day, check wellbeing, etc... but in the end we broke up also.

3. if you feel she is toxic, walk away immediately, dont wait. toxic relationship is like toxic gas being released into the air, dont wait for it to pass and assume it will be ok once it passes. the problem is by the time the toxic gas is gone, you are probably dead already. never dwell or question yourself when a r/s is toxic, a toxic relationship is hard to be recovered, once toxic gas is inside the body, it is hard to get out.

i was in a toxic relationship before and people around me told it is toxic and asked me to break but i thought i know better and just continue. in the end, it is really so toxic that the girl twisted the story behind my back. she tells all people that i know how i treated her so badly but she didnt mention what she did in the first place. she is overly-sensitive girl and some words she will get triggered badly and she will feel you are scolding her.

so, i would rather be single than be in toxic relationship.

yes r/s = relationship

overly-sensitive and triggered easily need to be handled carefully, it is like walking on a land mines... at first, you might feel ok but after some times, like you said it will be exhausting and you might do something unintentionally but triggered her badly then she will said you purposely hurt her, etc etc...