I am not entirely familiar with the matter, but I do know Matt and Beth have been divorced for a number of years, that the divorce stemmed from incidents when at the same time she leveled allegations against Silverman and also accused Dusty Smith (Cult of Dusty) of the same thing at the same conference.
Her account of the encounter with Silverman was, to me, very dodgey and included the claim that their "flirtations" included role play and a "safe word" which Silverman respected, and yet which she still deemed as inappropriate, despite the fact the Beth and Matt had a famously open marriage.
To be honest given the choice between the three of them I would trust Matt far more than Beth or the notoriously volatile David, but that is just an uninformed opinion on my part.