Not sure if mediation or even how it really works so me and my ex split up now over 4 years ago he’s now got a new partner no issues on this as I no people move on it’s life but he’s already introduced our daughter to this woman and id say they have only been together 2 months max he didn’t even mention nothing about this it was my daughter that come home telling me about her after he’s been going her house . Since all this it’s just been arguments non stop over stuff I’m trying to address with him