Co-parenting has nothing to do with being in love with the mother/father of your child.
It's two adults who both love their kid enough to have a healthy platonic relationship or at least be cordial.
@AppleMokoena I told her via text. I think she was shocked at first. She asked a lot of questions at first (naturally) but I visited her that weekend and she expressed how happy and excited she was to become a grandmother. She still shared her concerns but she is was happy shem.