Dude, face it. You're the rebound and she ****ed you over. Move on, and find someone who wants to be with you. Take her criticism to heart, and evaluate if there are things you need to change in order to be a better person. Then make the effort to change those things.
In my experience, when a woman "just wants to be single" for a while she's already cheated and is interested in someone else. But that's just my experience. Chin up, go find someone who wants to be with you. Anyone who doesn't want to be with you, isn't worth your time.
"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."