How to know if the girl next door likes my boyfriend and legit next door, she's annoying me. My boyfriends curious about her but for what reason?

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So there's this girl that lives next door, she is around my age 21. She seems to stare at my boyfriend and he stares at her but she's shy about it lol. There's been instances when me and my boyfriend were sitting out the front and she ran around like I don't know she was on crack or something. I was honestly astounished felt like she was trying to get attention from my boyfriend. One time she walked out in a white gown, it's just a coindence my boyfriend was out there at the same time...
How to know if the girl next door likes my boyfriend and legit next door, she's annoying me. My boyfriends curious about her but for what reason?
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