Don't unblock the him, he will only bring drama and chaos into your life.
Drama and chaos can be addictive. That drama and chaos has a lot of power and can leave you feeling lost & confused, angry, desperate, lock in, invested etc. You are right he is a trigger and avoiding triggers is very wise.
Drinking and drugging can bring chaos and drama into your life as well.
This is your time....step back, breathe..take some time and stay sober, you will cope better when the emotions come up. You can do this.