AITAH for telling my fiance my step daughter isn’t mine, sort it yourself…

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My fiancée then asked if I could leave the match early to drive her daughter to the activity centre. I replied, “Why should I?

She’s not my daughter, and I’m here with my son.”

Neither of us are talking now. I do pity for my step-daughter and I wasn’t being spiteful.

My son was looking forward to it and it would b2 about 4 hours of travel.