Dear sandy:
First you didn’t view his behavior to you as flirting. Then the thought entered your mind that he is flirting and following that- you became convinced that he was flirting with you. First you thought he was the nicest guy; now you think he is “dishonest or misleading.” First you felt friendly toward the guy, then you felt infatuated, then betrayed and put off and all through all these changes NOTHING HAPPENED. What i mean is there is no evidence in your post that he ever flirted with you- none whatsoever. There is no evidence he was or is dishonest or misleading. You built a story in your head, a projected story from your past experience and tailored your projections to a story that didn’t even happen.
This is amazing to me- we all do that, I only hope I do it less and hope to do it even less and less… how we SEE what we see not what is.
Regarding him being as nice with you at first when he was with his girlfriend and later not- it could be that he was preoccupied, maybe unhappy, dealing with some pressing issue and it was not about you at all. Please consider other explanations to what is going on before you commit or lock into only one interpretation.
anita