I'm 25 and she is 19. Man I used to have a younger sister that was her age. My sister was killed in a car accident 2 years ago...now that I met this girl I just can't stop associating her with my younger sister and I have a hard time seeing her in a sexual way...I keep looking at her as a young girl who needs to be protected. I've tried to change this but it's just so uncomfortable for me. Should I just break up with her? Other than this one thing, she is pretty much perfect for me I feel.