Why are guys so mean after a break up?

I don't understand my ex at all. So I talked to my ex Friday night and he said he might give me another chance in the future and that he will text me sometime. Well I lost it Saturday and texted him he said as of right now we won't be getting back together ever. You don't listen to me. Goodbye. I tried talking to him to apologize and his answer was no. Could he be acting like this because he's mad? Do you think if I give him one or two months no contact do you think he may change his mind? He gave me chances before so I don't know if he will change his mind. Please help what to do! I know I shouldn't of bothered him because he needed space but I missed him. He has changed his mind before in the past but I don't know if he will again
Why are guys so mean after a break up?
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