Has anyone had "no contact" not work for them and backfire?

So I did the whole no contact thing after I was dumped, even though she said she wanted to be friends, have me in her life and loved me very much. I did no contact for 2 months, went out had fun, tried to become a better person and secretly kind of hoped she would call me and contact me first. Now I found out she has a boyfriend who she's been seeing, and wants nothing to do with me.

Has anyone else had no contact not work for them at all and backfire?
Has anyone had "no contact" not work for them and backfire?
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