I posted elsewhere and got a lt of flack for it. Briefly, I believe his acquaintanceship is okay up until the point they become confidants. That is a no go for me and personally a deal breaker.

I would suggest you communicate this if you haven't done already. I've been bitten before. So, with this current relationship, I laid down the law.

I also know of the temptation to check. It can really reel one in, can't it? Have that conversation. It should also include his own deal breakers. Perhps, in having the conversation, he will realize this is such an important bother. You too may be surprized about his feeling on other matters.