I don't know anything about Discernment Therapy other than what I just saw on their website. I'd want someone who practices marriage and family therapy who has a systems theory or attachment theory (sometimes they'll say emotionally-focused therapy) orientation if possible (most LMFTs are trained in systems theory). And, definitely who is pro-marriage while understanding that some marriages can't be repaired.
But if he is really willing. I don't see why not. If he has already made up his mind & just wants you to work on moving on, then it's not the time.
Me: 50 W:43 S6, S3 M: 12 yrs. T: 17 M is bad & Not happy Bomb Mar '14 S 5 Feb '15 D Bomb 13 Apr '15 (but "no hurry") DB Coach May '15 Wants proceed on D Aug '15 Starting 1-on-1 negotiations Sept '15