Am I asking for too much?

There’s these 3 girls that constantly lie on my relationship and always asking if we’re still together because they’re obviously trying to break us up. I am with my boyfriend constantly so I know they’re lying about the things they’re saying. One of them is just doing too much so I suggested just blocking her so she couldn’t try coming inbetween us anymore. he refuses to block her and idk why? i’m thinking if she’s always lying about you and our relationship why wouldn’t you want to block her?