hi perlanga...you don't know me and definitely don't have to follow my advice...but you asked just how to go about dealing with getting over him and moving on. after reading all the responses, i realized everyone got so wrapped up in his illness that everyone forgot about what you asked. i went thru a terrible breakup with a guy who was very abusive and i suspected some sort of narcissism or anti social personality issues in him....infact i still think he's going undiagnosed with something because he is the type of guy who leads two lives, compulsive liar, and very very threatening.
basically how i got over all of that was by drastically cutting myself off from him. i moved from southern CA back up to Northern CA to be with my parents. i changed my phone number. i blocked all his online access to me. and then i thru my focus into myself. i was working full time then, working out five days a week, and being as social as humanly possible with friends and family. distance and distraction works wonders to heal. and in all the effort of working on myself, the following year i found a wonderful guy and am now married. when you take care of you everything else falls into place.
and even though you may moarn what you could have had with him, it's better to concentrate on the reality of what has happened to him. susceptibility to schizophrenia often have a genetic predisposition, and then trauma can really trigger it but even without the military trauma. it could have developed in him anyway with either some other trauma or he could have had a huge genetic component. schizophrenia so extremely familial and could have put future children at risk for mental disturbances. consider yourself lucky to have dodged the bullet now and i'm sure you will find the true happiness that you seek, there is someone for everyone.