I would not go into many details... my feeling is that there was an instant attraction between me and a co-worker when we fist met not long ago. We started getting closer and hanging out together (texting, going out for launch, to the mall, spend a couple of weekends together with friends etc). No actual dates, but we were spending time together and learning about each other.
Understandably, I started getting more and more into this girl and eventually made it clear that she's more special to me. At this point, my behavior made her feel a bit uncomfortable. I decided (by following advice) to back off for a while and see how she is going to react.
It turns out that she has a boyfriend. I do not know almost anything about their relationship, maybe she is not loving him anymore. However, I never felt like such a fool before. My heart is saying that there is something special between us, but my mind is saying that she was probably just enjoying the flirt and me being her new buddy.
Why would she "use" me like that? Is it possible that she is actually interested in me? I did not want to make the story long, so I may answer any questions to make it more clear.
Thanks a lot!