I've been with my boyfriend for three years, living together for two. He's the love of my life and I would never do anything to hurt him. Eight months ago we decided to rent a duplex with his sister, and things started off really great and harmonious. Lately though, I've been been forced to admit to myself that I'm really attracted to her. I've never had a lesbian experience or thought of myself as gay, and I would never want to cheat on him. But lately, I can't stop myself from checking her out and wondering what it would be like, just once. I have no way of knowing if the feeling is mutual, but she has never dated a man or mentioned one since I've known her. We spend a lot of time home alone together while BF is out. We laugh, talk, hug, and just generally have an amazing time together. Please help! I feel like I might be tempted to either make a fool of myself or do something that might hurt my wonderful BF.