irl friends problem (rant + need opinions/advice maybe?)

i have a friend group of 4, including myself, and we’ve been friends for over 5 years since middle school. Today, I accidentally found their social media accounts and discovered that the three of them have been following each other for a long time without me. They even have streaks together???

It honestly kinda hurts... Back in middle school, I asked them if we could follow each other, but they just joked it off saying, "Ew no, you’re just gonna spam my DMs with memes," so I just laughed it off. Other times, they’d say, "I'll DM you my username later," but they never did. And now, seeing that it's just the three of them... I feel so excluded. I’m so conflicted right now. Part of me wants to distance myself or cut ties, but they're still helpful when it comes to schoolwork, like sharing notes. but when it comes to actual 'close friends stuff,' I always feel like the odd one out