Wow I thought the same as everyone else, too!
If this person is truly a friend, I might bring it up. Once. That you noticed he's been acting different lately, it makes you feel really hurt, how do you think you can fix the situation, does he want to talk about it?
If nothing changes, distance yourself from this "friend". It's not worth the stress and frustration. Especially if you just end up almost in tears. Definitely not worth it.
Definitely keep your husband in the loop about the friendship & what's going on, though.