A little help please?

How to know if the guy you like is a toxic person or a fuckboi?
Note- I've been trying to do a background check on this guy and found out that he used to have anger issues ( used to break stuff and shi) says he's better now but gets irritated quite easily. And I don't know why but the way he talks reminds me of a guy i used to date who abandoned me so i feel really sacred.
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But he seems like a really nice person who genuinely cares about others but at the same time I feel really scared if it's true because of bad experiences.
A little help please?
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