what should i do?

It totally depends on wat the situation is. If it was somthing lifechanging or somthing that you consiter very serious than i would casually bring it up. like "hey i hurd blah blah blah... is this true?" or somthing like that. But if it was somthing that wasnt a huge deal than i would try to let it slide. Give it a few days and if it still bugs you then try asking him. Hope this helps sweetie! :)

As long as it isn't a life-changing situation, it's best to leave it in the past. If it still bothers you that much, just ask him about it and if he cares enough about you, he'll probably reassure you that he isn't like that anymore (or whatever response works best for what your situation is).

let it bee. women some anyway mature quicker. let the past fade .forgive : move forwards; but let him know the door is always open to go backwards, if he wants to lose the treasure that he doesnt see;-]

no :)
I'm sure you have exes too :D
It's no big deal. You'll just annoy him :)