Way too much drama.

Facebook is poisonous.

Also, why did you allow yourself to continue this when you knew she had a boyfriend?

As someone else said, if she became willing to leave him for you, that is a bigger risk for you in future.

Also, if she will go behind her boyfriend's back to chat to you, and arrange a "secret date", then she would do it to YOU as well in future (possibly).

If morals aren't of interest to you, you should have at least banged this girl (with video proof), just for your own satisfaction out of all of this drama.