Someone please help me before i go nutsssssssssssssssssssssssssss…

well my bf and i have been together 4 a yr n we've had a very rocky past but we recently got over everythin n decided 2 start new n b 100% honest w each other from now on.these 3 girls keep startin w me n saying how my bf is a cheater n how hes a sbag n they really dk ne thing. 2 of them liked him wen he was in 9th & i didnt know him bak then n they both hooked up w him. but he has really changed since i've been w them. so ne way all they talk about is me and my boyfriend. they keep saying how im so stupid and i dk ne thing he does 2 me & **** like that & its really gettin me and my bf mad. i no nothin they say is true. they r just so nosy and they want to break us up. my bf always tells me they are just mad cause we are so happy together. i am getting so mad over it though bc its somethin new everyday and they wont leave us alone. he told me today he cant wait to graduate bc then everyone will leave us alone n we can focus on each other. why do u think they are starting with us