Be busy with your own life. Limit or cut of communication and contact. Genuinely be happy with life. Be nonchalant with any reaction from them. Oh also don't be available make them wait for u
Lay it ALL out on the table and only make up if bold, obvious actions are being made towards correcting the mistakes. Otherwise it’s just a recipe for more hurt.
Depends on what the disrespect was, as there are levels to this…