What you commit this horrible mistake ?

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I am living with my gf and her best friend has come over to stay for a few days. I am sure few of you'll have guessed how this is going to end. Anyways, my girlfriend has to go to college and most of the time her best friend and i are alone at home. She does drop clues that she has a thing for me. Yesterday morning I was in the hall and she was bathing and she knew i was in the hall and she come to drink water in only her bra and shorts. Well, this aint normal, not in my culture. She gave me a smile and went to her room to dress up. Today , in the morning she called me in her room to check if there was a mole on her back and yes she was topless but covering her breasts with her hands, I checked and left quickly. Yes, I am a guy and i did feel an urge to make a move but i want to be loyal to my girlfriend should i make this horrible mistake ?is this even considered a mistake ?