Some time ago I wrote letter approaching it. H said I was mistaken and would not betray me. There have been moments that I want to bring up again but have not since then.
It was mentioned an EA regardless if OP has not recipricated. I agree with that. H def. in fog and does not see the wrong in putting his energy outside the M. It may not be foundation but does not help matters. Knowing he is at work w. OP painful. And him making last minute plans to escape is as well.
The way you confronted seemed good. As you said afraid would "tip him over" to BD. It is not a good feeling tho knowing his mind is set but neither is getting consumed in worrying so much. Ugh.