If you're the same Martin that posted on the niceguys forum, then I urge you to seek professional help.
If you aren't Martin, then please accept my apologies. Here's some advice: Dating people at work is not a good idea unless you are both interested in making a long-term match of it. If you can't see some very good potential for marriage here, or if you are simply uninterested in marriage, then I suggest you leave this alone. If you are looking for a more casual relationship, fooling around at work can get you into trouble *fast.*
I'd also suggest that you try to stop analyzing this woman's every move. You aren't a mindreader!
I think at least some of the "signals" you make so much of are more in your imagination than anywhere else. Take a step back, focus on something else for a few weeks. Like work. Stop focusing so much on her; that could eventually become unhealthy for both of you.