friend jealous (friends)

So I have this friend, my first ever boy bestfriend and well, he only considered me his best friend ever. But now I made a new friend and well he is friends with her and I'm a little friend jealous because he is always with her which I can't blame him because I'm so petty towards them, like I'm ignoring them and being so bitchy. These days I'm not really in a good place, very sad for no reason :(, but i just don't wanna feel this way. I get jealous so easily with my friends and it's so annoying, anyone get this feeling too?