Well. I was in the same situation but the remaining premie was me. My wife didn’t say anything about it, and few years later I left the cult by my self. She wasn’t special, she was pragmatic. We must let time for time (I’m not sure for the translation).
The couple is an association of two persons, not an entity. One off the problem with people in cult is fusion, fusion in the cult with others leads to fusion with anything, everything. As said Sting “If you love someone set him free”. Each of us has an individual world (individuation), trying to penetrate it is a rape, nothing less. Off course we are a part off something bigger, but that something is made off individual person with individual karma (this lifetime karma).
As the others I wish You to not suffer and to find a solution. Just you can remember that this person pursue happiness and end of suffering, like you. But compassion begins with ourself, if it’s too hard, save yourself. Have you got young children?
Our bad trip with M gave us some wisdom, we have to use it.
Migwell.