Technically, it's a temporary "pause" to allow one of the people to get their head straight, figure out their other problems, and get back on track.
In the real world, when such a request isn't accompanied by some clear goals, such as "I need to get caught up in my classwork, I need to get my apartment clean and organized, and I need to deal with my car that needs a lot of work," it's usually the beginning of the end. If he knew what was wrong, and that wasn't YOU, he should have told you what WAS wrong, so that you could get some sense of how long you would have to wait "on hold" for him. Without that information, "taking a break" is a potentially infinite pause, and that's not acceptable.
If you seriously can't talk about this with him, and get HIM to answer these questions, then I recommend that you assume that your relationship is over, and proceed accordingly.
Oh, one more point: in a relationship, text him somewhere like 1/4 to 1/10 as often as you want to, and find a way to be face-to-face with him instead. You should NEVER talk about important relationship issues in any thing other than face-to-face unless it's an absolute emergency, and then voice calls only, NEVER by text. Girls tend to over-text guys and drive them crazy. I'm not saying you did this, but if you think you MIGHT have, think long and hard about what I said.