I think what she's saying is that he found out she was poly and had consent to date, so they started seeing each other, and then she developed deeper feelings for him, only to discover he was in it just for the sex, or at least that is what she perceives.
Do I have that right?
Quietgirl, I'm sorry it turned out to be a sucky situation for you. If you want support or feedback on anything that happened, let us know. However, I have to say that we wouldn't have to try and figure out what you're talking about if you had only given us more info to go on! If you want to discuss something on a message board, it's better not to be so cryptic.