How do I fix me?

Why do I always seem to hurt those I love? Is something wrong with me? It the past I have always thought it was the other person. It was because of their faults or their personality traits that things always turned sour in our relationship.
Always them.
Never me.
Recent events have forced me to rethink things in my life. Past experiences have been running through my mind. Memories. Memories of how things were, how relationships ended, and who was at fault flooding my brain.
Was it really his fault? What if I had been there more often?
Maybe if we had spent more time together things would have been different.
Not that I wish things had ended differently. My life would have turned out different though.
I am happy with where my life is, with where it's going.
But now I am re-examining everything. Not because I want to change anything but because I want everything to work out from now on. I have to know whose fault it was before.
Was it really me, not him but me, who messed up?
How can I hope for things to be better now if I can't understand what happened before?
I am the only common thing in my past relationships.
How do I fix me?


Yes I know this post makes absolutely no sense. Its just something I need to work out in my head.