How to get your selfrespect Back after discard?

Well im still here crying after someone who mistreated me and didn't value me or my time and had no real respect for me. Then this Person Just casually threw me away.

If i had healthy selfrespect, i would be furious and don't Care for a Person that treats me that way anymore. Instead im here Missing them, idealising them, crying for a relationship that Hurt and shattered me and was very Bad for me.

So how can i get my self respect Back? I hate to be still so attached to a Person that didn't give a single F about me. They Don't deserve all this headspace and Energy they are still receiving from me.