Yes, I entirely agree. Even without being part of a group, women will support you as long as you are winning or at least appear to be winning. But the moment your position becomes precarious, they'll just leave.
There are evolutionary reasons for that: women can't side with someone who won't be able to defend them since they don't have the strength to defend themselves.
But nowadays you can't say that because of feminism and identity politics.
That's just how things are, and why I think men should always be careful about the trust they put in women around them. They are much more likely to throw you under the bus than even a man who dislikes you.