Make sense?

You have every right to be upset, and it's true, things suck. This advice I can give you though, when it comes to women...

If you're interested in a woman (even a little), let her know, then back off... let her take the next step. If she doesn't take one, take it as a "she's not interested".

As for her dealings with the other guy at work... Don't be a friend! Don't give her advice or warnings. Giving her advice like that completely patronizes her, and could also send her a message that all you desire from her is friendship. If you're attracted to her and it made you jealous, then just say so. That sends the message that you're interested.