I completely understand how you feel because I feel the same way!
I feel defective and unworthy because my H has told me the same thing - he doesn't love me enough to make the effort to repair the relationship.
How does it deteriorate to this point? How can they give up everything so easily? I have searched for the answers and unfortunately, I don't have them.
The answers lie within them. I'm not sure they even really know.
I wish I could tell you something to make the pain and hurt go away. I wish I had a magical cure. I really do.
What I can do is let you know I am here. I will listen. Vent. Share your feelings.