JEALOUS AND LONELY

So basically, I have this friend that I used to be best friends with, we stopped being friends because we went to different schools and etc; well we got back in contact because we both have sons the same age and we started hanging out more, we were getting to be really good friends again but then her other friend moved back to our town and now she is calling her, her best friend and plastering all over fb everytime they hang out and how 'she's the best friend ever' I feel like she's doing it on purpose to stick it in my face or something. But idk.

I know I'm being petty and dumb. I know. But would this annoy anyone else?

I don't have any friends, literally 0 and I was excited that I was becoming her friend again and now I feel like I'm back to square one. 😞

What would you do?