My boyfriend has PTSD. How can I help him?

Last night he got a little drunk and he told me his life story (which he apparently tells no one!). I already knew he has PTSD, but now I know why (child abuse, army experiences, etc). I feel like I helped at least a little just by listening, but I feel so bad for him because of everything he went through. I don't know much about PTSD, so if any of you have (or know someone who has) it, can you explain to me what he's going through and possibly how can I help him?
My boyfriend has PTSD. How can I help him?
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