"It's pointless to explain why
There's nothing I can say
...
It seems I can't be trusted
And I don't disagree
What made you think I ever really
Wanted to be?
...
And I don't know when
I'm ever going to want to
See her again"
Seems to me that he cheated on someone. He can't explain himself out of the situation, he's just come to terms with that his partner found out. The second paragraph suggests he's not surprised he did it, he knew he couldn't keep away. "Her" in the third paragraph is the girl with whom he cheated on his partner.
"It's pointless to explain why There's nothing I can say ... It seems I can't be trusted And I don't disagree What made you think I ever really Wanted to be? ... And I don't know when I'm ever going to want to See her again"
Seems to me that he cheated on someone. He can't explain himself out of the situation, he's just come to terms with that his partner found out. The second paragraph suggests he's not surprised he did it, he knew he couldn't keep away. "Her" in the third paragraph is the girl with whom he cheated on his partner.