When I broke up with the father of my son (20 years ago, but still) - we initially had a break and he moved into his parents, he'd come home for the weekends and we'd play families, take the boy out to farms, zoo's etc. Still see friends as a couple too.. still talked about planning our wedding and buying the new car we needed -but he'd always go back to him mums. In the end it was killing me and I ended it. A month later he moved in with another woman. I may be wrong, but this is what I see is happening here.