My friend is jealous of me and our other friend./?

I will try and narrow the story down a bit.

So me and my friend group has a gay best friend in our group. And my friend who was his high school best friend they are no longer best friends because he had removed that title from her a long time ago. But she can’t help but get jealous when me and him are doing things without her (which I totally understand why) but when I ask him if we should invite her he always says no because he’s sick and tired of paying for her. And ngl same. He has communication issues but he tends to respond to me but rarely to her. When I bring it up to him he doesn’t seem to care. Yesterday we went out and she had told our other friend how hurt she is because our gay friend doesn’t give her the same attention he does with me and I’m so upset because she’s hurt and I domy want her to think I’m in the way but it’s HIM not me 😭 I can’t help but think I’m his best friend now but I don’t think she’s ready to accept that yet.. I need help. Should I talk to her about this? She doesn’t know that I know she feels some type of way about our friendship. And to also add.. he comes over to my house and hang out with me more and he barely goes over to hers. I validate her feelings but how do I tell her it’s not me it’s him organising and planning things with me. And I don’t know why he doesn’t answer her phone calls and texts to me. 🥲 I don’t wanna be in the middle of it.. so what should I do
My friend is jealous of me and our other friend./?
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