What would you have done?

Iv been going out with my boyfriend for 3months. He was having a house party in his house, he had a drink in him but he knew what he was doing. He kept on disappearing and then coming back telling me how much he loved me.

he went off again, and I caught him in his mum and dads bedroom having sex with someone else. I took him back, but he carries on speaking to the girl... what can I do and what would you of done?
Updates:
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The FIRST night we were out together we went to his FRIENDS house as he was having people round, which I had NEVER met. My boyfriend expected me to have sex with him in a bedroom with the house FULL of people I never knew? Then he went into a mood! :/ ah!
What would you have done?
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