Recently I made a new really close friend... I think my other two bffs are jealous!?

Okay so at the last school dance me and this girl from my choir and history cl became really good friends. We text each other 24/7 we walk down the hall together, we stand in the lunch line together, we usually eat lunch together. My other two bffs seen to be jealous and I don't think they like my friend. They are always talking about me and her behind my backs. Like for example in athletics they are faster runners than I am and so they can keep up with each other and they're always giggling and whispering about something. Me and my new friend went to a baseball game together last weekend and it was the best baseball game i'd ever been too. We are getting really close and are planning to make a youtube series soon. I don't know what is going to happen.....