<human>: Could you distill the essence of the text into 1-3 sentences?

I feel like I'm living in an episode of Glee, and as a longtime lurker figured this was the best place to come. (insert obligatory never-posted-here-hope-this-is-legible)

I've been friends with Kaylee [17 F] when we both joined our high school's theatre program freshman year. She's a die-hard SJW and avid drama monger, but we get along well and I love spending time with her. 

We befriended Matt [17 M] in English class the following year. He and I became inseparable friends, but Kaylee had her eye on him in a romantic light. Over two years, they've "just missed" starting a relationship countless times. 

This entire mess came to a head a few months ago during our fall musical. Kaylee had been happily dating someone else, but Matt drunk dialed her one night and said that he still had feelings for her. Kaylee lost her shit and decided that she was cutting the poor guy out of her life entirely. I told her she was free to do whatever made her happiest, but I would still continue to be friends with him as he had done nothing to me. 

All was well...until last night. Our school Valentine's dance is this weekend, and I didn't get to attend homecoming this year. I jokingly asked Matt (as friends!) over text and tweeted the picture. 

An hour later, a very angry Kaylee calls asking why I'd betray her, how could I not spend Valentine's day with our group of female friends, and claiming that she's "terrified" of his friendship with me. 

Yikes. Should I go to the dance? Ditch the dance for Galentines? Cut the poor boy out entirely? Am I in the wrong here?
<bot>: High school is stupid. Closest friend wants me to cut another friend out of my life, but selfish me wants to go to a school dance. What on earth do I do?