<human>: Can you summarize the given text in a few sentences?

I(m/33) like this girl(f/25) I work with.  I have told her, she knows I want to start things with her.  It came at an inopportune time as she was married when I really knew I liked her and told her.  We hung out some together, got lunch alone for a couple of months, and were talking a lot.  She was already unhappy in her marriage, cheated on the guy with another guy(not me), and finally divorced after a long period of arguments with the husband.  She never told me she wasn't interested, seemed like she was when we could hang, and then found out after she and said she was going to try and get through some issues the ex caused her that she was dating the guy with whom she cheated on the ex.  I know we have a bunch in common( interests and life goals), 90% of the time I can make her smile and/or laugh, and we genuinely seem to have a good time doing things together.  I did the whole why not me thing and am over that.  I know that I'm not what she wants and I accept that I cannot change that no matter how much I think we would be great for each other.  What I want to understand is if you do have that much in common, you generally enjoy the persons company, and they happen to be of your sexual preference, why would you still not want to try with them and see if things can develop between the two of you?(I know plenty of relationships where there is no attraction between the two and then after some time figure out they were great for each other.Also sorry that got long winded.)
<bot>: If you have things in common, enjoy each others company, and they are of your sexual preference, what could be a reason for you to still not try and see if things could work with them?