What do I say to him? Please help

I am meeting with my ex partner on Monday ( today) to discuss moving his things from our shared home. We were together for 2 years and lived together for the last 7 months before he discarded me. I feel my entire world is shattered. I truly saw my whole future in him. Part of me knew my needs were not being met, but I was patient, loving, and willing to work through anything for him. I want to protect myself. Part of me knows I can never take him back, the other part of me wishes he would just come home.

He was avoidant and left with very little explanation. He lied for months saying everything was fine. I just want to move forward now. Seeing him feels like tearing open the wound again.

How can I go about this process with the most self respect and kindness to myself? I'm scared of embarrassing myself because I am evidently suffering as a result of his betrayal.