Hi Scrappy, Having an Om/OW is not necessary to be classified as MLC, however; in most cases an ow/om is involved. My H told me there was no one else and he wasn't the "type" to have an A and like you, I believed him...but one month after our separation I found out there was an OW from his work. An ow/om serves as a bandaid to fix something, fill a void...in my case H's OW made him feel "young" and she was a party girl so he was out sowing his oats while I was left with two young children. This does not have to be the end all be all, I see your H filed...well so did mine, we went to court and everything and then H changed his mind...my H did come home about 1 1/2 years ago and our M is better than before.