If you two were the ones who were dumped then the dumpers have NO RIGHT to be upset that you are happy now.
It sounds like they expected you to mope, to wallow, and to pine away once you were "no longer blessed with their presence".
That type of behavior really bugs me a lot
They broke off the relationship. They made that decision. They cannot now make judgments about how you choose to live your life once they cut you loose.
