Consider my ex-boyfriends upto isomorphism

Consider my ex-boyfriends upto isomorphism:
I'm rather fond of them all.
You aren't, but that's something that anybody
Could have foresaw.

Two of them were like my father,
Two of them helped me through,
Two of them thought they loved me,
One of them was you.

You were the first; you showed me how
And I don't know why I need that destiny now.
And I don't know why I need to run my hand through your hair
And you don't know why I need to explain.