The mother of my child and fiancé of 2 years just decided today that it's over when hours earlier she kissed me and said she loved me how do I deal with this..

There are a million shades of 'over.'
If she suddenly went from love and kisses to 'it's over,' then I would give some hope to getting down on bended knee and asking what you can do to make it better. What is she missing, what is gone, what can you do to bring her love back? Are you taking her for granted while all she does is change diapers and cook and clean?

And why the heck haven't you married this mother of your 2 year old yet? I'm getting a little tired of the word fiancé.