Hi there --

I'm sorry that you are in pain right now. I watched the "open relationship--open marriage" philosophy tear couples apart in the Sixties and Seventies.

Jealousy is a natural human emotion. Open relationships are not for everyone. As a previous writer stated, if this is causing you to suffer, you will have to evaluate whether openness is right for you.

This may, indeed, mean that you lose your gf. You will have to decide what kind of suffering you prefer -- suffering because you are not emotionally comfortable with sexually open relationships or suffering because you lose your gf when you insist that your boundary for exclusiveness be kept.

Or perhaps you need to insist on threesomes. It's not my ideal, but you will have to decide what's right for you and whether the others will respect your boundaries and needs, once you work them out.