Again, you're putting responsibility on yourself.
Maybe he was just unavailable because I was always so depressed.
So he was emotionally unavailable when you were married, and has continued being so regarding DC , after divorce.
Nope, that sounds conclusively like it's him. Just how he is.
I find myself wondering if you , being depressed,on some level, chose someone who wasn't too demanding, wasn't really up for being emotionally intimate.
Whatever. You didn't cause his interactions, which sound like quite a lifelong pattern. You did not cause this.
What you did do, which was certainly the greatest gift you could have given to your DC, was to leave an unhappy relationship, and overcome your depression. Those are considerable achievements, which will contribute to your DCs ability to grow up happy and healthy. Go you!
Celebrate what you've given to your DC.
Does my divorce guilt story resonate? Was watching a lovely family , on a family day out, and feeling sad/ guilty that this would never happen again for my DC, because I left their father. Real heart stab moment.
Then I shook myself, and remembered that, on a typical family day out, there would have been huffing, blaming, sulking. And that we actually had more fun without him.