The line, "I see those bubbles pop up like you're texting," came from another song that Trevor Rosen, Brad Tursi and Matthew Ramsey had started to write but never finished. They loved that lyric, and it fitted perfectly into the song, so they put it in.
Ramsey explained to The Boot
that the text bubbles are an example of "a real thing people deal with, where you're looking at your phone and you see that they're texting and then it just goes away. It's a terrible feeling! That's just real life, and we try to keep it conversational and keep it as real as we can."