I am unbelievably qualified to answer this question. I was in a very similar situation about a year and a half ago. I was with an amazing woman, and everything was perfect. Except that I’d only been in one long bad relationship before her, while she’d had lots of dating experience before me. Here’s what I learned:
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The open relationship won’t work. You can’t go backwards from exclusive to non-exclusive.
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This is a problem for you, and it will only get worse.
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You need to break up with your girlfriend, and force yourself to be courageous and pursue as many women as possible. You can break up with the understanding that you’d like to try getting back together in the future, but you can’t keep dating.
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It would be better to lose this great relationship than to poison it with doubts and/or cheating.
I followed this exact advice myself. I broke up with my amazing girlfriend and dated other people for six months or so. As soon as I’d had a good enough look around, I knew that she was all that I wanted, and managed to win her back. I was lucky – she took me back. We’re getting married next year, and now I’ll be able to be with her without reservations or doubt.
Even though I learned what everyone said I would – casual dating is a pale shadow of a loving relationship, you have to see it for yourself to kill the wondering. This is your life – you don’t want to live it feeling like you’ve missed out.