I am sorry that you're going through this. I know it must be difficult.

Forgiveness is about your feelings, not his. Someone once told me it is simply no longer wishing someone would be punished for a wrongdoing. It has to come on your timetable, not his.

Nothing you do has to justify his behavior toward you. Even saying goodbye and wishing him well is in no way a show of acceptance for being treated poorly. On some level I imagine he knows full well the impact of his behavior even if he never consciously expresses it.