Need some help don’t know what to do, I’ve been sleeping with my best friends brother and she doesn’t know. I lost my virginity to him and have really strong feelings for him, he is also 4 years older than me. I chose to break things off today due to not being able to come to terms with losing one of my best friends and ruining the relationship between him and his sister. Is life too short to throw away something that could have been great? Is it too much of a risk to tell his sister?