teenage! urgent!

I'm 16. me and my boyfriend broke up over a month ago. we text on and off, but it's nothing special and he cheated on me. his parents tapped into his phone to see what he was talking about and got in alor of trouble with other people and saw "sexual" things between me and him while we were together. it was normal things for my age. his parents told my parents. we text once a week usually and he tried to get me back when I always turned him away. he cheated on me and hurt me. his mom who is an alcoholic repeatly calls me and texts me and threatens me to stay away from her son when I try to. but she doesn't think he did any wrong and threatens to tell my partners things. what do I do? is that harassment because she does it when I try to grant her wishes?