Denied and debunked. You should know better than believe idle tittle tattle from fake news media.
Elon Musk debunks WSJ claim he had affair with Sergey Brin’s wife
https://www.teslarati.com/elon-musk-debunks-wsj-affair-sergey-brins-wife/
Yes, Musk’s denial is proof of his innocence and a thorough debunking.