A man of quality simply must wait until he finds a match and/or young women grow up more. I watch so many young women turn their backs on a "good guy" because he is not exciting or dangerous. They make a train wreck of their lives. If they go too far, no man with character will want them, especially if they have children by a bum.
"Messed up women" can be fascinating with almost a siren draw to them. I learned the hard way to look, but not touch. Marrying them is a sure path to your personal and financial destruction.
Wait ... have patience ... frequent places that women of substance go to ... be forgiving of past mistakes if real change has taken place ... look at women from other cultures or countries ... look at care givers, nurses, waitresses.
While you wait, go ahead and give of yourself TO A LIMIT. Then, stop. You may be looking at a person in great need that you can not help ... a person who will run back to the tough guy who beats her.
Finish last? Not really. Who really lost?