Engaged girl advise?

Ok this already sounds bad but she's engaged an we obviously had a thing in the past. Anyways she wanted too stay friends on fb with me an she still flirts with me on thier an walks all over her fiancé an I'm not scared of him. But anyways we stayed in an she said if it doesn't work out with him she's going right too me after that an we date agin an we stayed in touch till I told her I'm gonna go date other girls while your engaged an she blocked me after that an didn't reply too her txt either. Is this the end of talking too her or do you think she will be back or am I just living in a fantacy land an forget about her? She was the one that got away.