How do you forgive when someone used you?

Hindsight is 20/20. Starting to realize I was pretty much played the entire time in my situationship. I was so scared of losing him that I would’ve done anything but he didn’t even want to date me.

More important than forgiving the other person for disrespecting you, how do you forgive yourself for letting that happen?

How do you forgive yourself for letting someone treat you as disposable and use you?

How do you get over self pity? How do you work on your self esteem in the midst of heartbreak?

Thanks fam :)