Bf’s family is ruining my relationship!!!

Bf doesn’t call me as much cause his older brother told him not to chase girls and not to be a simp so now he’s not really calling me throughout the day and when I try talking to him about it he says he’s gonna listen to his brother cause his brother has a high body count. My bf says I can chase him and that woman have no value until they prove to him they do. His brother is feeding his mind all this bs. Before his family got involved in our relationship we were a happy couple. It sucks.