In a nutshell we have been happily together for almost 15 years but before we got together (aged 18 )whereas I was his first girlfriend in EVERY sense, I had been about a bit, well, a lot actually. He knew that right from the start and was always quite disturbed and jealous but it's not like he could do anything about it, and since we got together we are trusting and happy and totally faithful etc etc so I thought he had just dealt with it.
So now all of a sudden he is literally on the verge of some sort of breakdown becuase he suddenly can't stop thinking about it. He says he constantly imagines me with these other guys and it makes him sick. Although he admits that he knows it is irrational and in every other way we are happy etc he can't get over it. He is in tears, sulky, depressed, shaking, vomitting and having chest pains and panic attacks.
I am trying to be sympathetic but finding it really hard. I have told him that I won't apologise for the past because that was me then so why should I - that's something which I know upsets him. Other than that I am being reassuring and saying I am trying to be supportive and listening to him when he is upset, but TBH I am at the end of my tether. There are only so many times I can say that I am now a different person and totally happy with him and wish he had been my first too but I can't change what has happened so I just don't think about it. I Just want to say - pull yourself together, this is so dumb. I am dreading being alone with him because I know he will start moping on about how upset he is and there is just nothing I can say and do because I can't change the past. I am even thinking of leaving which is crazy because we are happy in every other way, but I can't live with this constant worry and upset and the pressure he is putting me under. Now I am starting to feel sick and shaky wondering what he is going to say next. Maybe I am just being too cold and unsympathetic about this, but what can I do. He has got a doctor appt for next week because he says maybe he needs to get counselling of some sort?
How can we move on when ultimately i can't change what has happened, I won't apologize for it, and I can't change the fact that my previous behaviour is so against his really uptight morals. So how do i go forward?
Any thoughts, please?