<human>: Can you give me the gist of the text in a nutshell?

I have recently realized that I have started to really develop deep feelings for a friend and asked her out on a date only to find out she just started dating someone else(a Co worker). While they aren't technically exclusively dating she said that she really liked the guy and didn't want to mess it up by going on a date with me and wanted to focus her efforts on him.

She and myself had a short fling and we're pretty much dating before I chickened out and called it off a year and a half ago. We never really stopped talking although there were a few weeks of lulls in the conversation. I finally had the courage to ask her out again only to be turned down as previously described. I have since really started to open up to and she has helped me through quite a bit. I haven't told her how much I truly care for her other than asking her out. Ultimately I want her to be happy and I feel like I might be too late, but I just don't know what to do about my feelings or what to say. What should I do?
<bot>: I have feelings for a friend who just started dating someone else and said they don't want to mess it up by going on a date with me.