You're right, I don't own her, but we both agreed upon something when we entered a relationship together, and that was to be faithful. Like I said before, If you are the type to want to fling around, a relationship isn't for you imo.
If she wants that type of stuff, then by all means, leave. I'm not going to stop her, because she obviously does not want what I want, and it'll cause more problems, but she has told me time and time again that she loves me more than anything. I'm the first guy, out of 20+ guys/gals that she can honestly say she loves/loved. I'm her everything, world etc etc. If I acted like I OWNED her, I wouldn't let it happen, I would baby her in terms of her life, and I don't.
also, to everyone nagging at the idea of pansexual, it just means she looks past gender, and loves the person for who they are, not for their gender, it's not a copout.