in laws and friend(girl) 😩

Hey girls,

So my husband and I have been married for 3 years. We are very happy together but I am feeling annoyed with my sister-in-laws. So, before dating me, my husband had a friend girl which kinda looks like me but he said he never liked her as more then a friend but he knew she had a crush on him but he never acted upon it. I knew this girl liked him because she would always try to compete with me and comment on his pictures and stuff but eventually he stopped talking to her and cut all connections to respect our relationship. As a men should lol. Sooo, me knowing this things, this girl has asked about him apparently to my sister-in-laws. I know this because they told me themselves and they know i don’t like her because she’s always wanted to be with my husband. But everytime I talk to my young sister in law (16) she always brings her up and tries to say she has two (sisters-in-laws) and pretty much saying that she likes the other girl but she says it in a joking matter. My older sister-in-law doesn’t mention her as much but I always see her interacting with her on Facebook. Which annoys me because they know she likes their brother( my husband) but they just always keep contact with her. I tell my husband about it and he tells me to ignore them because the one he loves is me. I obviously can’t stop them from talking to who they want to, but I just wish they had more respect towards me. Especially knowing I am not fond of this girl. Also, when I’m with them they are sweet and nice with me and it seems like they like me but I’m not sure if they are just playing nice. Advice?