Do you ever feel like if of your relatives likes your man?

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well my cousin lives with my family and i and sometimes when my boyfriend comes to visit me, if i'm sitting with him she will not say anything to him and as soon as i get up she has something to say. at one time i used to wash some clothes for him and i day i realize that she washed his clothes and her clothes (her referring to my cousin) i did not say anything i just let it slide until i realize when he ever comes to check me if i'm not outside when he arrives she just stop what she is doing and spark a conversation, so whenever she is speaking with him i go inside and sometimes my boyfriend get mad at me because he said he dont find my cousin attractive. Do you think i am going about this wrong? Yes i spoke to him about the situation but i dont want to approach her because we are not close cousins so i just spoke to the one i love. Please tell me what do you think i should do?