Co-parenting is about YOUR DAUGHTER yet you never mention that aspect of co-parenting. It's all about your partner.
Yes, your partner left. 90% of the people on this site have been dumped and left. Join the club. You gloss over WHY she left. It sounds to me like you had a very unhealthy R with your partner and that certainly is NOT a good way for a child to be raised. Now you have decided to continue that trend by being pissed you have to co-parent.
You are going through "personal crap" and so is your partner.
As far as you saying "it doesn't end for me". Well, keep thinking that. You have the choice to end it but you are choosing not to.
All this whining is really getting on my nerves. Yes, you got dumped. WE ALL DID. Yes, it sucks. WE ALL KNOW HOW IT FEELS.
Maybe it eats at your W she has to co-parent with you. Ever think of that?