What percentage of MLC'ers have someone else?

[scrappy]

I believe my STBX is in the middle of a MLC. I am not sure as it seems his behavior falls into just regular db'ing. Anyways, I won't post my sitch here, due to lack of time, but had a question I wanted to pose to everyone. Do you think MLC'ers all have OW/OM? My stbxh claims he doesn't and I do believe him as he really is not the type to do this sort of thing. Maybe I am being naive. I am sure everyone is capable, as everyone is human. He does have 1 good friend that I am sure he leans on pretty heavily and I think this person sort of fills the role of the other person. Is having an OW/OM necessary in order for a sitch to be "classified" as a MLC? I am just curious what everyone thinks about this....