I have had a girlfriend for 8 months now and now that the summer has started, we had to go our separate ways. She wanted to embark on a casual/open relationship for the summer and get back to normal when the fall starts. I have negative feelings about this and don't know how to go about telling her this. Could she really be looking to hook up with other guys since I'm not there? I asked her why she wanted to go into a open relationship and she told me she wanted to get a couple things out of her system. I called her about it, because anyone could have guessed what those things could've been. I tried to get it out of her but she kept on telling me I have nothing to worry about and it's not a big deal. Thoughts please?