This is the similar to the advice given on Sosuave.
Since I didn’t sleep with her, a lot of the responses were “you didn’t listen to her” “it was a waste of time” “I’ve never been friendzoned”. ‘You were humiliated”
If I had slept with her, the responses would have been “good you brushed it off, girls are silly“. “Good you focused on your goal”. “Good you weren’t fazed by her words”
The advice given on Sosuave depends on the outcome of the situation.
Yes, on most forums people judge a decision by how it turned out instead of by what information the person had at the time. That's just how online advice forums usually work. But if you ignore the outcome and just look at the advice people gave in this thread, a pretty clear pattern shows up.
The first debate was what "friends" actually means. The majority (about 60%) said to treat it as a soft rejection, respect the boundary, and not waste time trying to change her mind. The minority (about 30%) said the label isn't decisive, to watch her behaviour instead, and that if she's still willing to spend one-on-one time with you there's still an opportunity. Regardless, they even admitted the odds were low; they didn't say it was impossible but that the most possible outcome it was that it is unlikely.
Secondly, the next debate became whether, even if there's a chance, it's worth pursuing. The most common answer was that even if there's a 10% chance, a man with options is better off pursuing women who show clearer interest. The argument was that the expected payoff in a situation such as this is too low. From this perspective, "friends only" lowers the odds enough that pursuing someone else is the better expected-value decision, even if exceptions exist.
So overall, about 3/4 of the replies were basically saying to treat it as a rejection, or at least not invest much time into it, while about 1/4 thought there was still a chance if you handled it well. The point was that, based on the information available, the higher-probability outcome was that it would not become romantic, and the odds were not in your favour. Looking back, that's exactly what happened, you had a few lunches together, but it never progressed beyond that.
Lastly, I'll leave you with a quote from
The Art of Seduction:
"Throughout life we find ourselves having to persuade people—to seduce them... Seducers, whether sexual or social, prefer to pick the odds... To leave people who are inaccessible to you alone is a wise path; you cannot seduce everyone. On the other hand, you must actively hunt out the prey that responds the right way. This will make your seductions that much more pleasurable and satisfying."
Hope this helps.