"is it really unnatural to be resentful on some level of friendship"

It's one thing to lead someone on with the promise of something more you have no intention of giving...that's pretty bad. It's another thing to assume "hints" like gifts demonstrate romantic interest and that acceptance of said gifts, constitutes leading someone on. I don't think they do. I think it's the onus of the…

Um, no. In an ongoing relationship, people usually have unspoken consent for certain things — like kissing/initiating sexual activity, or stealing their food, etc. But, that usually only happens after a lot of trust, and with the knowledge that either party can revoke consent.