My partner wanted to go out to her friends birthday party at the friends house and take our 9 year old son with her. She said she would be back at eleven.
I agreed and took her to buy a dress, birthday card, gift and some booze for the party. I gave her a lift to the house and went home to look after our other two kids.
She came home at half past midnight. Turns out that she left our 9 year old at the house and went out on the town. She asked my son to lie to me and say she had been at the party all night.
She's lied to me many times in the past, but teaching my son to lie to me and cover for her is what I find most upsetting.
Feels like the last straw to me. Am I wrong?