I think the therapy has helped you pin point your boundary with precision and articulate it with clarity - which is an absolutely huge achievement in the context of his persistent and entrenched gaslighting, manipulation, self-serving self righteousness and emotional hi-jacking of your entire family (the suicide threat is emotional abuser big guns weapon of choice - just vile).
You have perfectly justified it and how this is so critical to your emotional health / existence.
You have given him time and space to see the light / feel the loss / come to his senses. He has not gone through this experience at all - if they have not seen each other it was not his doing and he is desperate to see her again and to drag you along with him to assuage his delusions.
Actions speak louder than words. He doesn’t hear you, you and your family are not his priority, he is not kind, he is not respectful.
Sit with your rage and observe it for all of the suppressed hurt, shock and betrayal it represents. Move on to solo counselling now to support you in understanding where you are now and what options you might have in the future.
There is no rush to any of this - prioritising tending to and protecting your own battered emotional health is very important right now (because you are getting zero from him).
Seems that you have had a significant emotional shift from the previous holding / hoping pattern.