HELP! Can a guy really change?

So i used to date a guy who used to be a certain way but now he claims to have changed his ways?
He says he's more mature and yeah he does sound different to me but i don't know if i should trust him.
What if he goes back to his old ways, when push comes to shove?

So im asking if you are or know someone who has genuinely changed for the better?
And in what ways did they change?
HELP! Can a guy really change?
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