My friend has a crush on my crush who has a gf but is close with me

E:boy age 15
T:girl age 14
Me:girl age 14
R:girl age 14

So I’m friends with this guy at school(E) and I’ve had a crush on him for months. I believe he has a small crush on me or used to at least till he met this girl online(T) through a video game. They haven’t met in real life and it’s long distance. E, T and I have a group chat we talk on daily. She seems like a really good person so I made sure to have her back and put my feelings aside even if I’m hurting in the process. All my friends know I have a crush on E. One of them(R) decides she’ll be a double agent for me since they have the same bus stop. Till now E and R have had little to no interaction. Then today R says she has a crush on E. She tells me that she got to know him a little bit over break but didn’t really have feelings for him till now. I play it cool trying not to cry and say it’s ok. Then during lunch R talks with me alone and says how long distance relationships can be broken and I get a little frustrated for T because she’s disregarding her completely even though she knows about them. She even jokes about asking him to the approaching dance. Heck T was the only reason I didn’t tell E about my feelings. Finally at the end of school as I walk out I see R talking to E and when she sees me she looks a little threatened. Mind you it has only been a few days since she has even talked to him a lot. I join them in their conversation and she leaves for school sports practice. She says bye to E but when I say bye she doesn’t even look back. Up till now R has been a lovely friend. Yes we’re somewhat rivals in singing and academics but we’ve never let that get in the way. What should I do? I don’t know if I’m in the wrong here. Please tell me your advice.

TL;DR My friend has a crush on my crush and she is disregarding the fact he has a gf. She’s only really talked to him for a few days and is aware of my feelings.