I feel like regardless of whether you were judgemental, clearly you and he had different moral compasses and likely wouldn't have made a good pairing.
I could not do what he did to his own son and I could not date someone who did either. I have a friend who had a similar experience - one day he was sitting on his couch with his family and a policeman came to the door and told him he had a 13 year old son (from a one night stand before he was married). He and his wife FULLY embraced the surprise child. I am especially impressed by his wife's handling of a situation which could have spelled doom to many marriages.
That's the kind of man I'd want to be with. Not one who shirked responsibility when it came knocking. I'm not sure if I answered your question, but apparently I'm the same kind of judgemental you are, so maybe I'm not the best one to answer it 🤣🤣
I actually wrote another article in which I postulate that the point of life is learning to care for others. It seems to come down on all of us at one time of life or another where we end up having to care for a sick or elderly friend or family member. And we can choose to be angry and resent it, or simply learn the life lesson we're being handed. Your date made what I would consider the wrong choice.