I’m not sure real closure is possible without contact, but I am 100% sure you can move past this and live a happy life even without what it feels like you need right now.

I would Google ‘how to get over an obsessive relationship’ and take all advice given. Zero contact is typically recommended as excruciating as that seems. You need to avoid any and all emotional triggers or you will be back to Day 1 of grieving.

Budfox posts interesting research tidbits on how clients get into this mess (I don’t think it was your fault), but understanding the dynamics of what hapens to certain people in the therapy dynamic might alleviate your guilt. Whether to move forward with a new therapist is your choice.