I have my children for tonight and this happens every two weeks. I live with my girlfriend and her daughters. My children are 8 and 11. My step daughters are 13 and 16. The 16 year old is away for the weekend and the 13 year old came with me to pick my children up today. We had a a great day and didn't get back until 5pm. My girlfriend had been at work. We had something to eat tonight together then I wanted to watch the rugby as it was a big game. It is the only thing I really like to watch. Halfway into the game my children had gone into their room to play on the Wii. My step daughter had come down from her room to sit with Mum. Whilst I was watching the game their discussing something on the laptop and laughing. I couldn't hear what the commentator was saying on the TV so I turned up the volume. The step daughter then said oh we were only laughing. I said what do you mean. She then said you are obviously wound up. I said no I'm watching the rugby and I can't hear what the commentator is saying. This went backwards and forwards with my girlfriend then sauing Ok you need to be quiet now and stop getting annoyed. So all I kept saying was is that I was trying to watch the game. I started to get heated as I felt I was being told or made out to be wound up. This escalated into an argument which led to me swearing just as my daughter walked in. I was then told by girlfriend that I had acted like a lunatic and my children would have heard me getting angry when I really felt like I was being made out to behaving a way I wasn't but eventuality I got wound up and frustrated. It does upset me that this happened with my girlfriend and her daughter. And my children. Before my girlfriend went to bed she told me that I find it easy to be rude to her daughter but not my children. That also my children would report back to their Mum that I had been rude and arguing. I am upset now and don't understand how this has happened. I welcome any advice. Thanks