After 6 years I agree with some posters above that she is most likely just not completely fulfilled. An open relationship is not a relationship to me, its an acquaintance/f**k buddy thing.I **** that term btw. She wants to keep you like a spare tire, just in case the new one doesn't work out. She always has you to fall back on. Simply a slow motion implosion of a friendship posing as a relationship with perks in my opinion.
If you don't want it just say so. Let the chips fall where they may. You don't need this. If you're doing all you can to keep her happy, then your conscience should be clear. If not then work on that and hope for the best outcome. Taking a woman for granted and falling in that "I have her, why keep trying to impress her" comfort zone is a big mistake I see many men make. Don't get me wrong I'm not saying expensive gifts or such things, or that you are in the wrong here. I don't know the whole story or you or your gf. Make sure you're giving of yourself. Giving her your time, showing your love and saying it now and then too. Woman need attention, to be appreciated, need to be needed. Like that song/saying goes "Little things mean a lot" Many marriages fall in that nasty comfort zone and fail miserably. When you stop trying and settle for what it is, seems that's when the trouble starts.
LL
