My boyfriend(27yrs old) of 5 years recently broke up with me b/c he fell in love with my sister(17yrs old), she is 10 years younger than him, and he doesnt want to feel this way for her. he is disgusted by how he feels, and he doesn't know how to make it go away. he knows that she will never be with him. personally I think he is confused by their friendship, but I dont know. Is there a reason he move past this, do you have any advice as to what is going on in his mind?