Your xh sounds like a very insensitive man to me. I would back off - not to be unfriendly, but to detach from this unkind and thoughtless behaviour. He seems to have little emotional intelligence
If it MLC behaviour? Who knows. Some posters may feel that your h is being normal after this length of time, and being married to OW, but it still feels deeply insensitive to me.
If you are unable to discuss it with him, then I really would back right off, and not expose yourself to further hurt, as you still appear to care deeply for this man. [As I do for my awful xh] I am not sure why we go on caring for these people - they have trashed us in every way, but we do.
As I recover my self esteem I do see my xh much more clearly as emotionally inadequate - not always, but certainly now, and for the past 6 years. I am glad not to have to be around his weirdness, and communicate occasionally by email. I thought he was moving through the tunnel, but now feel he is stuck, and will remain there. Hard to face up to . . . but I feel better about myself.