Being myself a former WH I can tell you are doing a lot of mind reading that you do not need to. When you get surrounded by the A fog you discover a new world of joyness and limerence that makes you feel alive again...it doesn´t last. Feelings inside me kept on warning me of that. My W being the lighthouse for my S and me did the rest.
So there is no need to compare to OW. And no need to analyse your WH behavior towards OW. Maybe the greener grass is still being watered there but time takes its toll. Be patient. Just be the lighthouse, keep GAL and enjoy your kid.