I hooked up with a girl a few weeks back. I don't have any feelings for her, but she told me during our hookup that she has feelings for me. I don't really care about that but whatever. A close friend of mine has started to really like her in the weeks after I hooked up with her, and she has been leading him on. Last night she asked me to spend the night with her on Friday. On one hand, I am attracted to her and it would be fun. But I really value my friendship with the guy who likes her, and part of me doesn't think that I should hook up with her, especially considering he always talks to me about how he wants to ask her out etc. What do I do? Is it viable to just hookup and not tell him?