MindSeeker

What a complicated story! I don't remember the exact wording, but Ayn Rand said when you are in love, you see your Values in the person you are in love. So the way you "use" another person to revenge is not right, in the end you are the one who will have to suffer from your action the most. However, romantic love is a relationship, it takes two to complete. So there's no use to chase the one who refuse you. But before making your final decision, make you all your thoughts and true feelings are well communicated to your love interest.

Value is what you perceive by Your own mind, Your own reasons. And sex is only a part of the Love equation. When you see the value of having sex with somebody you don't love, and s/he is informed or clarified, then there's nothing to stop you. At a certain stage when you no longer see the value of having sex without love, you will know it's time to change.