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?

It's not possible for anyone to get your private because it is some sort of random generated alphabets which only you have authorized access to unless you gave it out or your wallet got compromised through hackinga or by submitting your private keys to a fake sight