Why do we try and fix what's broken??

I have been divorced for 4+ years now... I seem to find the men that are "broken" and fix them. This is great for the next woman that comes along, but still leaves me alone at night.
I know we all have our issues (my biggest one is trust), but why is it I can help other people get over their issues and still not get over my own???
I seem to find the "emotionally unavailable" to "fix" and find them great matches. Unfortunately, I have liked everyone of these guys, but didn't know how to tell them. I seem to be one of the guys and not something more. I'm great at "fixing them" for someone else. Why? I am attractive, smart and independent... that is what every guy says they want, but it seems that they all go for the cute and needy type.
Is there a point where we just say enough is enough and walk away from the dating world or do I keep fixing these guys for other people???