Sorry just another point I wanted to add, your brother isn't the one who caused your trauma, do you feel the same hatred towards your ex who actually did caused the truama? I presume so and also presume you have nothing more to do with your ex. If you can't get past the fact that your brother didn't help you I would just cut all ties with him, but you still need to find that peace in your heart otherwise you will live the rest of your life this way.

Regards,
Dianne