I cannot say what he will or won't do, but I am only telling you these things to pre-warn you of what could be coming, is likely coming. Yes, I agree that if you face him with some things before even suspecting them, that will push him to do them most likely. So totally agreed there. I can only say that you don't seem to think his entire personality will change because of this.... let me tell you it will. Mine did, and all those I know with PTSD are nothing like what they used to be prior to trauma. Not a one of them. If he heals over years, then yes he can regain some of his personality and traits, he will be similar to what he once was, though will never be the same even after healing. He will be a newer version, hopefully more improved in some areas, though he will be weaker in others.

I once used to be the rock, the one those around me panicked and came to me. I was the one who doesn't panic, who can rationalize under extreme stress and chaos. Now though, whilst I can still do that, afterwards I would be ill for some time. I would have to smoke and drink merely to cope with it to begin with. I would be quite angry and aggressive to anyone who came near me afterwards, and even then medication wouldn't come close to fixing any off it. He will be different, he will suffer and be extreme during his uncontrolled period of learning what is wrong and that he must act on fixing himself as nobody else can do this for him. He must learn these things, he must first experience them to learn what he does and does not want to be.

Unfortunately there is no time limit, nor amount of suffering or hurt he will inflict on those he loves most before he realises these facts. Some commit suicide whether directly or indirectly before ever realizing they can heal and learn to control their lifestyle once again. Some are destructive for decades, some only years, some maybe only months before realizing they need to seriously work on themselves and have constant professional help. There simply isn't any benchmark you can gauge this from, and its all going to be unique for him and yourself and anyone else in his life. It is merely best you know and understand these things now so your not going to be as shocked when reality hits you.