I liked this one, too!
I used to think that . . .
I couldn't live without him.
I would never get over that lost love.
it would always hurt to see him.
the pain would last always.
the tears would never cease.
I knew what was best for me.
I wouldn't be able to move on.
I wasn't that strong.
I would never be able to shed the weight.
I just wasn't that disciplined.
(Isn't good (for once) to realize when you're wrong?!)