Can we trust our bestfriends?

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I don't know how to tell this, but sometime i feel i can't trust my bestfriend. my BF just very nice to me when we just side by side, but if in front of people or our friends, he just enjoy embarrass me and mocking me even tell my bad side of me, i don't know why but i feel sad with him/her because his/her mother leave him so i can't get angry, before i meet him/her he was very lonely but right now he is very annoyed me so i dont know how to respon with him CAN I TRUST HIM/HER? WHY I MUST TRUST HIM/HER? DO ALL BESTFRIENDS LIKE THIS?