Why Did He Go Cold After Dumping Me?

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He didn't dump you. By your own admission you were never really in a relationship, he made that very clear from the outset. As much as you might wish it was otherwise, or find that your feelings for him were very real, he didn't give you any false hope. He explained he was biding his time before being deployed, and was only interested in having sex, but not a relationship.
He has been very unkind to you, treating you dismissively and making you feel bad.
This isn't about you; it's about him. He wasn't ready for a relationship, he didn't have the love to give. We cannot make of someone what we wish they would be.
You have done a wonderful job of maintaining your dignity by refusing to vent on a social networking site. Not many young women or even those of a 'should know better' age can refrain from leaving those pathetic 'woe is me' cryptic little memes and messages when they really ought to. All semblance of class goes out the window as they go into drama queen mode. Well done you for not being one of 'those'.
Your parents are right, though, as parents tend to be!
You have to get him out of your system. No looking at his profile page, no wasting mental and emotional energy on such an unworthy target, rehashing in your own head what went wrong. I think in your head, if not your heart, you know this guy wasn't good for you, or for any girl really. Let it go, be good and gentle to yourself, and make a deliberate effort to mix with other people and spend time doing things you love.