He's in the cousin video in the back on the left side. so unless she's into dating her cousin, I don't think so lol
That's definitely the boyfriend. I assume he's just in this video to fill the space, because it's not like we can identify all her cousins anyway.
He was also in the "guess which guy I'm dating video" (and was the coziest of them all) and in the reflection of the TikTok you quoted. And he delivered her breakfast in St. Moritz in one of the vloggy TikToks. I'm fairly certain they met in Miami (in the friend's building) and she goes back there, because that's home for him. But he's got $$$$ so he can travel back and forth with her to upstate New York and London and NYC and, ofc, Miami.
If they do end up married, I wonder if he'd be willing to move to London, because I can't see her committing to Miami.