Guy that treated me bad is treating me really good now?

Me and this guy been off and on for years and he came back 4 months ago and now he’s treating me super sweet and I’m so scared and I don’t know why he has changed. Is this a good thing or bad? Guys, what does this mean when you used to treat a girl like a option and mistreat her now super sweet and there all the time?
Guy that treated me bad is treating me really good now?
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