Wrong. Clint broke up Clint's marriage. No one forced him to cat around with her.
I have to agree, Clint was the one that gave the marriage vow and broke it. Even if Sondra made the initial advances, no matter how tempting, it was Clint’s duty to keep it professional, politely put a stop to it and treat her like a co-worker only.
I hold none of this against either of them and will continue to enjoy watching their movies.