hey,
I wonder, even if the probability so small is, if someone else get the same private key as me could he/she spend my Bitcoins and viceversa? would we have the same Bitcoin Adress?
Yes, if someone like you gets the same private key then that person will have complete control over your wallet. But in reality it is impossible to generate the same private key and the same bitcoin address. Take care of your personal key and never try to share it with others so that you do not have access to your wallet. Otherwise the fraudster will spend all your funds.