Too much is a bad thing

The saying too much of a good thing can be bad....is it true?
I've recently been informed I am at fault for all the negativity in my life. I am at fault for those I have cared so deeply having walking walked out of my life. It is my fault they left because I have cared too much.
Does this statement really bare any truth? Can a person really care too much? Can they give too much? Can being cared for or receiving too much from others really cause someone to want to walk away?
I have been left by my parents who turned their backs on a small child. I have been left by friends who said they would never leave. I've been abandoned by lovers who I gave my heart without walls. I have been left by my children.
Now, I am told each of these people who left me,who have caused me to doubt if anyone will stay, they each left because I cared too much, because I loved too deeply, because I gave too much - too much time, too much love, too much for them.
I once loved people the way I now hope to one day be loved-without reservation. Then time and time again, I was left. I became broken and skeptical.  I put walls around my heart and stayed in my own space. I became a sleepwalker in my own story. I did not feel and I did well in life. I was void of feeling....or rather I had learned to repress them all. I quickly learned to keep my head down and not create bonds with others; no bond meant no hurting when they walked out of my life.
In my bubble, I was my own worst enemy. I allowed the guilt of my past to walk through the door to my life again. Promises were made that were never meant to be kept and yet again, I was caring enough to believe.
Apparently, it was my fault for loving and caring.
Recently, I allowed someone to break down the walls from the outside rather than the inside as the last. For the first time I allowed someone who wasnt a part of my past into my head, into my past, into my inner most deeper feelings and the real stripped raw me. For a while, it was a give and take. Then I somehow crossed the line; I cared too much. I gave too much of me to someone who didnt really want it, who would never appreciate it.
I am then made to be the bad guy. It is my fault for caring too much, for giving too much, for being me. Why ask to be let into my walls, if you never wanted to be there?
So, again my question....can I really be the blame for everyone who walked out of my life simply because I cared too much, loved too deeply, or wanted to give and make people feel special.