Well, Melania knows he was a cheater since she was cheating with him on his previous wife. Remember when she bragged about it at the 2016Tepublican Convention? She said they had been together 19 years, when he had only been divorce 18 years. And, remember he was cheating with Marla Maples and others when he was married to Ivana.
“Well, Melania knows he was a cheater...”
I know nothing except media gossip. Trump once said he cheated during a marriage only once, probably what you mention.
Depends on what gossip you want to believe.