I think I'm experiencing an emotional backlash after things going better than we both expected on the overnight stay itself. Yes I coped pretty well on the whole but in retrospect I realised it was largely through diversionary activity and then using a drug to help me sleep. Over the weekend it really hit me how much this is changing our relationship and how I am not the only man in her life now and that's really hard to take, I feel extremely depressed and a profound sense of loss. I do not like the idea of permanent insecurity, it just sounds like hell to me. Even the most pro polyamory websites and authors make it clear that to do this well you need to be able to examine and overcome your own sources of insecurity and have strong self esteem, I don't have that at all, and examining my own trauma just takes me to very dark places. However the alternatives are even worse, splitting up, which neither of us wants or condemning my partner to being unable to explore other relationships, which would make her unhappy. I think the depression comes from feeling all these options are bad and pretty much trapped, the least worst option is me trying to deal with it and allowing her to continue and I'm trying to be pragmatic about this, hoping over time it will get easier, but I don't know if I'm strong enough. At the moment I feel I just have no energy and whatever I do everything is going to fall apart.