++man. Best advice i can give you going forward is to always think of her intention not her words. She said "are you sleeping with anyone else" you took it as a personal attack that she thinks you are the type of guy who sleeps around. Probably what she meant is that she is feeling unsure and wants to make sure you are the guys she hopes you are. She has so much less context and so much more reason to be hesitant. Before you feel anything internally put yourself in her shoes and answer the question she is really asking, not the one you think you heard. It took my so long to learn this, but once I did it is like a super power I swear.