I think you've hit the nail on the definition of romantically interested, there.
[ Also he's figured out who you're talking about.
He talked to you in the army, too. So he's aware that the only person you really spent much time talking to back then was Kimblee. Also, he knows Armstrong and Roy well enough to know that you didn't spend time between the war and now talking to them.
So Kimblee, then.
... He's not sure what to do with this information. ]
no subject
[ Also he's figured out who you're talking about.
He talked to you in the army, too. So he's aware that the only person you really spent much time talking to back then was Kimblee. Also, he knows Armstrong and Roy well enough to know that you didn't spend time between the war and now talking to them.
So Kimblee, then.
... He's not sure what to do with this information. ]