elvis not everyone is the same though; I know plenty of together parents who do prioritise child-free time together; at the expense of other family activities, because they recognise how important it is for them. Are they wrong, because in your opinion 'together parents' aren't entitled to that?
As for all parents wanting every weekend with their DCs if they could - that's just not true. I could have every weekend with my DD, if I had chosen to stay with her Dad, or had chosen to exclude her Dad from her life - but I didn't, and wouldn't, even though I could and can. I do not want my DD to spend every weekend with me because there would be a gap in her life without her Dad in it, but she would be subject to hostility and tension if he and I remained together.
And, I may well be in the minority, but I have always found being a mum bloody hard work, and frankly, I enjoy the break. I insisted that my DD and her Dad spent a long weekend with his parents, leaving me home blissfully alone, when she was a few months old, and I have always prioritised child-free time for myself throughout her life. I am fortunate that my DP feels the same way; had he insisted that we shared all of our time together with one or more DCs (his or mine) as well, then it wouldn't have worked.
It seems that for whatever reason, the OPs DP is no longer prepared to accept her desire for child free time; which seems to bring a natural end to the relationship, really.