W and I have had some talks and I do believe she is just friends with OM (most evidence points to this).
After how much she has lied to you, over long periods of time, why do you believe her now?
Most cheaters, if they admit to anything at all, will cop to one level LESS than what the truth is ("just friends" = "emotional affair"; EA = PA, etc.). For your own emotional well-being, I'd encourage you to just figure that it's most likely a full-blown affair, and proceed accordingly.
