Need Advice

I’ve met my boyfriend cousins daughter twice the first time she was clinging to his arm and the second time was this past weekend on a camping trip. And just from being around her I think his cousins daughter has something for him. On this camping trip she got an attitude more then once because the attention wasn’t on her. Then she got mad because she couldn’t sleep in the tent with us. We then went fishing the next day and she told my boyfriend to stop touching me in front of her. The touching was rubbing my leg. Her attitude is just so nasty and she tries to control him. Then she had a dream about us and it was definitely nasty.