Cinderellaman - the NC has been going on no tme at all!! This is much more like gardening - there are no instant results. My last nc contact [before this one] was 4 months, and I am currently 4 weeks into the new one.
I swear [as do many others on these boards] that time run on Pluto time, or like treacle - VERY slowly for them.
We all doubt that they are in MLC at times. This is one reason we know we are sane and they aren't, because they do not admit to doubts.
In any case, even if he is not in MLC have you ever looked at the stats of men who leave happy marriages for other [particuarly younger] women? Affairs seldom beceome lasting relationships, but they do last, usually a minimum of 6 months, and up to two years [in MLC this can last longer, but I think the majority are over within 2 year [please correct me if I am wrong on this, anyone].
The more suitable the woman, the more you should worry. If she is young and silly he will get bored, and who konws - so may she.