How do I help a guy with PTSD?

I work at a supermarket in Chicago.. we had this new guy join us last week.

He was around 30, 6' and ripped. He just doesn't talk or mingle with any of us, even the male manager or other truck drivers or anyone.

He really reminds me of Sylvester Stallone from Rambo, both in appearance and behavior

He always sits by himself staring at space (Which I made out was a sign of PTSD from Google), but does the work assigned to him flawlessly. He would do heavy stuff like loading-unloading much better than us 6 women women combined!

Also he would, for a second, quickly react when he hears loud sounds, for example, when a customer drops something big or when someone turns on a drill.

When we enquired, the manager told us he was in the military and spend a lot of years overseas.

I tried talking with him a few times , and he mostly answers with a slow nod just like Rambo or a very short reply. There's no way I was able to engage a conversation more than half a minute.

Now, I am not going to lie, but I really have a crush on him... but I am more concerned to help him if he is going through a tough time...

(I am going anonymous cause I am sure he does not have a phone, forget social media.)

How do I help a guy with PTSD?
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