The only commonality I can think of is that a lot of the guys I connect with tend to have some level of mental or emotional difficulty. And in fact pretty much all of my closest friends at some point in their lives have seriously considered or even attempted suicide. It just seems to be the personality type that attracts me, though none has been overly melancholy or depressive at the time that I met them. Perhaps it's just a certain amount of self awareness that stems from such an experience that piques my interest.
This is interesting Toph. Since I don't know you, here are my questions as I was reading it. Could it be that you were attracted to these people because you think you can help them to get better?...since you could relate to them due to your own history. Maybe not consciously, but in your subconscious, maybe you look at them as projects to makeover? I only ask because a couple of my ex girlfriends tried to make me over into their own image in their heads of whom I shoud be. I didn't like that. And...I'm just as guilty for trying to make someone over as well.

I wanted to be her knight in shining armor on a white horse rescueing a damsel in distress. Damn fucking hollywood for feeding me shit all these years!
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I have learned, and I know better not to do that ever again.
Maybe you should change your strategy to date people who have their shit together. It does not mean they don't have flaws and insecurities. We all do. They need to be able to enjoy life to the fullest with their warts and all. They are comfortable in their own skins. If they do that, most likely, they will accept you for who you are and not trying to make you over.
A lot of guys and I use this strategy for dating women. If I'm sexually attracted to a woman, I refuse to go to the "friend zone" with her. I will befriend her flirtatiously and not just be her loyal friend. Only when she turns me down, then I would become her friend and still flirt with her (not as aggressive though). When the opportunity to date her came up later, I courted her again. She was not surprised at all because I have already expressed my interest when we first met. Then we became a couple...together for 2 years. She saw me as a friend and a lover...not just a BFF. I found this strategy to be working on men as well.
It's like changing lanes in traffic. I lift my turn signal on first (make my intention known that I want to change lane), I wait until traffic is clear for me to make my move.
When I go to a club and see someone I'm interested, I go up to them and start talking and flirting from the get go. I don't hang around her for 5 minutes or longer to summon up my courage to introduce myself. If I waited, it would appear
to her that I looked around and didn't see anyone I like...then
I have to settle or
force to talk to her out of boredom. It works in gay bars too.
So go out of your comfort zone and try something new.
