Too close friendships??

I’ve been seeing this boy for a little while and I’ve noticed that a lot of his friends are girls and that’s all g but there is one that is always sending him xx’s and 💓💓’s and today she got him to go over to her house and he gives her piggy back rides and she sits in his shoulders but he went to hers so she could make him pancakes for his bday and i really don’t want to be a clingy girl but it makes me a little uncomfortable and i wished it didn’t. How do i stop feeling jealous?