<human>: Give me the gist of the text in a nutshell

We dated 3 years 1st and 3rd year long distance 5 hours away 2nd year we were together because we were going to the same college.  I have been in plenty of relationships. 
   One thing that stood out about her is there were never games and we worked really well together. This was her first real relationship I took her virginity and we had talked about marriage. 
   Anyways I really thought she was the one and a month ago she just left saying she didn't want to be in a relationship anymore. I talked to her once a week during the past month we even hung out once. We had a good time hanging out and laughed like old times. But driving her home she said "we still enjoy each other but it doesn't change anything". 
  I've done the pleading knowing damn well that I shouldn't but its hard to resist. Anyways I thought this girl was the one and now shes dating a co worker only a month after we broke up. She has not known this co worker for more than a few months because she moved back from college at the beginning of summer. 
   This girl means the world to me and I don't know what to do. I would just like any sort of constructive advice. Thank you in advance.
<bot>: Dated girl 3 years. Thought she was the one. She broke up with me and is now dating a co worker a month later.