sounds like you may be a little more serious about the relationship than she is. it goes both ways, if she feels like she needs to screw around and not involve you in the fun then shes looking for something she needs and apparently it isnt you.
my relationship is different, my girl doesnt attempt to even hit on another girl till we've talked about it first and agreed on the girl, even though i might not be there the first time. sometimes i am, sometimes i'm not but it gets pretty hot just discussing it and picking out girls.
so, theres a lot you can do to keep the relationship going if thats what you both want. if you cant deal with it or she just wants affairs without you there maybe you should end it. good luck
