So I've been talking to this guy for a few months now on WhatsApp he's always been honest about the fact that he has a gf and that he's just looking for a friend's with benefits type thing. Well we arranged to hook up and then I turned him down the day he was meant to come to my house, I had an attack of concience and told him I couldn't go through with it. He told me his relationship wasn't a happy one and that what his girlfriend didn't know wouldn't hurt her. I still said no. Didn't hear from him much after this apart from the odd message to see how were both doing. It was brought up again recently and know I honestly don't know what to do. He's a very attractive man and I can't stop thinking about what it would be like to sleep with him. But I also know I wouldn't be able to live with the guilt of knowingly hurting somebody else. Any advice ???