Put your feelings to the side , apologize for what you did or didn’t do, forgive , be the bigger person and remember it’s about the child best interest

I'm not a single mom but I do have to co parent with my ex husband (father to my oldest 4) and the best advice I can give is something I've learned over the years and that's to just take every situation as a new one and approach each one with an open mind and only the best interest of the child in mind.

Your feelings for the other person need to be separate from your feelings about what's going on with them and your child. If you dislike them because of something they did to you do no bring that in to interactions they have with your child. You have to make sure if you do have an issue with their interactions that it's not being colored by negative emotions you have towards them for something that has nothing to do with the child.

I know I basically explained the same thing multiple ways but it's so important. You don't want your perceptions and feelings to color how your child views them and vice versa, they're relationship is separate.