Yes, but we couldn't date because we were both in committed relationships. She was a co-worker of mine and it was one of the best/hardest things to do in my life. I think knowing we were both in committed relationships and knowing we couldn't be with each other just upped the infatuation that much more.

Yes and Maybe.

I have had a few infatuations, as I think you are describing them, at different times in my life. They were intense feelings and very strong attractions. Most were when I was younger. None of those feelings were ever returned in kind. The few that did lead to any kind of a relationship never lasted very long.

That usually doesn't happen to me right away. I may be intrigued and want to get to know them better, and then after I time I may feel that way. I have to be careful though not to get carried away if the feeling isn't mutual.

I met a woman and after our first date, I felt like I found the best drug in the world! For weeks, I went to work in the morning feeling like I was barely touching the ground! But the timing was wrong (I was separated, not divorced) and she was kind of bipolar. The rollercoaster ride was wild and emotional, but unsustainable. I miss that feeling ?.