Why would man bring his best friend's wife to his house at 2 am answer the door with his shirt unbuttoned and tell his girlfriend no one else is there?

No one knows the definitive answer to your question. You need to analyze the situation. He is being dishonest with his girlfriend, probably being unfaithful with his best friend's wife and his girlfriend should accept the reality of the situation and move on.
No one knows the definitive answer to your question. You need to analyze the situation. He is being dishonest with his girlfriend, probably being unfaithful with his best friend's wife and his girlfriend should accept the reality of the situation and move on.
No one knows the definitive answer to your question. You need to analyze the situation. He is being dishonest with his girlfriend, probably being unfaithful with his best friend's wife and his girlfriend should accept the reality of the situation and move on.

No one knows the definitive answer to your question. You need to analyze the situation. He is being dishonest with his girlfriend, probably being unfaithful with his best friend's wife and his girlfriend should accept the reality of the situation and move on.

No one knows the definitive answer to your question. You need to analyze the situation. He is being dishonest with his girlfriend, probably being unfaithful with his best friend's wife and his girlfriend should accept the reality of the situation and move on.

No one knows the definitive answer to your question. You need to analyze the situation. He is being dishonest with his girlfriend, probably being unfaithful with his best friend's wife and his girlfriend should accept the reality of the situation and move on.
No one knows the definitive answer to your question. You need to analyze the situation. He is being dishonest with his girlfriend, probably being unfaithful with his best friend's wife and his girlfriend should accept the reality of the situation and move on.
No one knows the definitive answer to your question. You need to analyze the situation. He is being dishonest with his girlfriend, probably being unfaithful with his best friend's wife and his girlfriend should accept the reality of the situation and move on.