What will you do if you were me? (Please i need your oppinion)

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one days ago.. i went to angela house which is athien girlfriends house and athien is my friend. i went to her house because she needed me. I am her friends too. angela is sad because athien is not care about her anymore like the way he care before. And angela wanted me to accompany her because she feels so lonely. Beside that athien always went out with other girls. So, i went to her house and accompany her. After that, athien is also went to her house and saw me sitting next to her and talking. athien is thinking negative and mad at me. he said that he don't wanted me and her anymore and he also said that he don't think want to have a friend relationship with me. WHAT SHOULD I DO??? PLEASE GIVE ME A IDEA??? DO I AM MAKING A MISTAKE???