Well, for what it's worth, I think you have done the right thing. Better to not get caught up in that drama, it doesn't need to be part of your life.
I can see how it's hurtful though, you did have that sliver of hope, which is now gone. I know you won't want to hear this now (but I will say it) - it might be a silver lining. I'm not sure how long you two have been exes - but maybe you will now be able to look at your life more and what you want for yourself and your child.
Coming right after this, that won't sound very comforting, but maybe just pondering what your life could look like, what you want, will be of some comfort.