This is a 1969 comedy Western starring Robert Mitchum as a retired marshal after bad guy George Kennedy.

Martin Balsam is the married town mayor who keeps a girlfriend on side -- Tina Louise.

It's tough on romance when they get walked in on.

I had to look at this because for a second I thought it was the short lived TV show that Bob Denver did. But now realize that was just called "The Good Guys" only.