It's bad to date someone who isn't single.
Marla had met Todd and his wife at a party over the weekend.
Marla wants to visit with Todd.
Marla invites Todd and his wife to her house for dinner one night.
Marla invites Todd to her house for a candlelit dinner date.
Todd and his wife enjoy their visit with Marla.
Todd thinks that Marla's invitation is weird, and he avoids her in the future.