The forgiveness process after someone has abused you is not about reconciling yourself back to them, or to a compassionate idea of them.
It's about untethering yourself from the abuse and it's impact on you and reconciling yourself back to yourself.
If you feel bitter and resentful it is likely because you haven't fully forgiven yourself for being powerless. Not because you haven't found deep compassion for your abuser.
Grieve, acknowledge, release and remember who you are instead of trying to understand the person who abused you. That's their job.