How do I know if he wants me or just doesn't want to be alone?

So a guy I jused to date says he wants me back. It ended because he wasn't honest, talked to other girls and acted shady. Now he wants me back and says that he was acting the way he did because of insecurities and because the relationship was moving forward to fast. How do I know if he really want me or just doesn't want to be alone?
How do I know if he wants me or just doesn't want to be alone?
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