A break is typically the precursor to a break-up.
What can you do? Take care of yourself, maybe work on why you cheated on him previously so that you don't develop a habit of repeating that mistake.
Pretty much all you can do is take care of you, your happiness, and honestly I'm not sure why people aren't more defensive about these things.
Either a person knows what you're worth, or they don't. Taking a break from them to date other people (because, what other point is there for a break than to gain perspective) is pretty much a cowardly way of saying, "I want to break up because I am unhappy. I'm giving up, but I'm going to keep you around dangling on a chain as backup."
Why don't people get angry about being treated this way? Instead it's oh, woe is me, he wants to leave!
"Well, then," the Cat went on, "you see a dog growls when it's angry, and wags its tail when it's pleased. Now I growl when I'm pleased, and wag my tail when I'm angry. Therefore I'm mad."