You seem new to this, so I'll fill you in, that's what scorpio men do, if he's having some personal issues he will be shutting you out, they do this even after years and years of relationship and trust. That's how they deal with it.
Honestly he may be tired of reaching out to you first 24/7. As a Scorpio when i feel like I'm the only one putting in most of the effort i start to feel drained and like the relationship is uneven so i pull back. I wait to see how much effort they put in to reach out to me first. So my advice is that he's still interested, just tired of putting forth all the effort, it's your turn!
The above are two possibilities why he's all of a sudden cold with his communication. You've got to make a decision here. There's no point guessing what's happened to him, that's going to get you no where.
If you like him, YOU take the initiative and talk to him. No one wants to be the one who always makes the effort, regardless of signs.