I am sorry you are feeling this way; it's very difficult.
I don't see anything that points to inherently failing in relationships.
Swinging between strong detachment and strong attachment is not that uncommon, and a notable Leo trait. With Chiron in Leo and in the 12th, I think this may be from where you derive your experience. And the square between Moon-Mars and Venus may also point to movement from one extreme position to another in regards to your feelings in relationships.
But honestly, your chart has no standout red flags; really looks you have a rich feeling life and are mostly in need of someone to share it with. Potentially much time lies before you for your life to continue to unfold, and it is brimming with infinite, unknown possibility. The practice of breathing, patience with the world, and, especially, kindness toward yourself will help carry you forward.
I am truly wishing you the best.