I ask for your serious opinions. Asking strangers might bring in some much needed insight.?

I'm 20 years old and she is late 30's and has 3 kids, one of which are older than me but others are under 10. She also happens to be one of my managers in my workplace. To make a long story short Im in love with her. We were dating for a while and as our feelings grew I could tell that she was changing. Perhaps in the beginning she believed I was just a temporary fling, but I know it turned into something more. At first she wanted to end things before things got out of hand but I managed to convince her that we could turn this into a meaningful and lasting relationship. Months pass by but there were troubles that kept coming up. Stress from being my manager and trying to hide the relationship were affecting us. I tried so hard to fight it and keep at it, but she eventually ended with us for a week, later we would get back together. Some time passed and eventually she stopped talking to me and seeing me as much as we used to. I tried to to talk to her, to get her to open up but it seemed like she wouldn't. Eventually I grew angry and impatient and made a hasty decision to break up with her. I pointed out all the reasons why we shouldn't be together, how she wouldnt communicate with me, take me seriously, if her kids could ever see me as a father, if she could deal with being able to be completely open with our relationship and even consider marriage. Its been almost three weeks and I never felt strong about what I decided, it feels like I just gave up and should have tried harder. Now she ignores me at work and I really have no idea what she is feeling right now. I tired talking to her over the phone and text but she wont answer. At this point maybe its too late, but I really don't want to give up without a fight. Your opinions and comments will be a appreciated seeing as how I don't know how anyone could possibly have an answer.