My wife 'Liz' and I are both 32 and we have been married for 3 years.

She is a teacher and has recently been telling me about 'Maria' who is one of her friends who works at the same school as her. Liz has been saying that Maria has been down lately since her boyfriend broke up with her and Liz suggested that I go on a date with Maria just for fun. Maria does not know that Liz and I are married. Liz says that it would just be one date at Maria's house and then never see her again.

I declined this as I love Liz and to go on a date with someone else would (imo) be the same as cheating. She argued that it's not cheating if she gives me consent to do it. I stood my ground and continued to say no. It makes me uncomfortable to even think of going on a date with someone who isn't Liz. Even if I did want to do it, it would be unfair to just ghost Maria after a first date as Liz suggested. It would probably make Maria even sadder than she already is.

Liz claims that I'm being mean and that I should just let Maria have this chance. I said that Maria can have this chance with another man. I said that I'm disgusted in her for trying to force me to go on a date. I'm also worried that if I did agree, she would twist the story and claim that I cheated on her with her best friend.

Liz has let it go for now but is still annoyed at me. Did I do the right thing?

ETA: a lot of people have been commenting asking why Maria doesn't know her best friend's husband. Maria has only been friends with Liz for about 6 months and they met at the school (definitely not long enough to have came to our wedding) and I don't know how close they are. I also wonder if Liz is purposely leaving out the fact that she was married.