Stuck between 2

Well my ex bf he has a older brother and he wont leave me alone he keeps grabbing my hand and grading and i didnt like he is was so annoying and he is my ex bf brother and i already have a bf and i dont want him to know cuz he would flip and i dont know how to tell him stop it or leave me alone without sounding mean i dont like him i like well amor my bf and stuck between 2 and im sick of it !!!!!!!!!!!! i told my ex little brother to tell him to stop it he didnt believe him and im just tried of him i like my guy not him