Oh yes. The old "Look what a nice person you've rejected" routine.That's the scam abusers (not saying your ex was an abuser, just a very confused temperamental person) use to bind people to them and call 'escapees' back into line. But you sound strong. Stay firm on this.
Even though I don't know the guy I certainly know the type. The tantrums only escalate. Best make a clean break while you still have some happy memories and won't feel the years were wasted entirely.
Just thinking about @Sunflower91 having to fetch that package.....
Might be an idea to have someone go with you when you pick it up. One of your parents perhaps, just to sit outside in the car so you can just collect the package and get out of there quickly and have someone there in case he a] kicks off or b] puts on a charm offensive and tries to sweet-talk you and play with your mind.
Just a thought.