I think the very individual aspects (the when, how, why) of the loss interacting with who you were then, how life’s curve balls and leg ups shaped who you became have an enormous impact on your abilities in terms of mate picking.
I don’t think I would have been so singleminded in terms of who the future father of my child would be had I not first had a, really not good, first marriage to shape me.
As unsuited as we were the marriage gave me access to my late FIL, and my late StepFIL.
Late StepFIL is the best man I have ever known bar DH. I knew him his role as stepfather, father and of course step-father in law. The warmth, the well maintained boundaries, the compassion, the space left for development guided by carefully chosen words of advice. There’s just too much to write to explain the whole package of the man he was. And I knew something of the compromises my former MIL made as a wife, in order to have him as father and father figure to her children. Because I also knew FIL. I knew why he was her first love, because I saw my own first husband in him. And I had moved heaven, earth and continents to be with DH 1.0.
The contrast utterly doomed the (already doomed) marriage, because it cemented for me that DH 1.0 and I could only have children if I was willing for said child to have 2 parents with complicated family backgrounds. And having seen the alternative in Step-FIL, he made it impossible for me to pretend I hadn’t seen the potential for choices. He also gave me a template of elements to look for. A “map of the right kind of man” if you will.
I’m not denying I used some (unusually good by my typically awful standards) judgement. But it was judgment that was possible only due to the dumb luck of being in the right place at the right time. Had I never met Step-FIL, things could well have gone in a completely different direction.