Your ex sent you three conflicting messages: he would like a break, it was a breakup not a break, and he's sorry for what he said. He wants to meet you to explain why he reacted in such a manner and would like to get back with you.
His second message hurt you. It broke your heart and to make matters, you got confused when he said he would like to meet with you to fix whatever led to the breakup.
For now, it would be better if you ask him to give you three days to calm your mind and heart. During this period, you should reflect about the relationship, your ex and you in it. Would you like to get back with him? If yes, why? If no, why?
After the three days, contact him and arrange when to meet.
Remember, the three days is not only to reflect about the relationship but also to still your mind. You don't want to react negatively when you meet him or after giving his reasons for his reactions e.g. shouting. You want to have a clear perspective of the relationship (and whether you'd like to continue in it) and also be able to state your side without being too emotional.