Last time you posted about this girl, I asked what you'd done to try and woo her. Someone else suggested you make a move. However, you didn't bother responding to that thread at all.
Do you actually want help, or do you just want to vent? If you want help, then tell us what your goal is and what you've done so far to reach that goal.
Also, on the subject of worrying that she's alright...and on the previous post about her falling for the wrong guy, it appears that you don't trust her judgement or her ability to take care of herself.
Never regret anything that has happened in your life. It cannot be changed, forgotten or undone. So, take it as a lesson learned and move on.