last weekend, I had a party at my mom's friends house, their daughter who is really pretty and she is my homies cusin. well we are pretty close and so we were like chating and chilling in her room and we were having fun, until some dude stepped in, and after that she does not talk to me anymore and start to talk to that dude, I dont understand, is she trying to make me jealous? or she just dont give a damn about me? cuz we are pretty close and I think she likes me and I like her too. so anyone know what should I do in a situation like this?
appriciate any help