Do all NPCs have 3 heart events?

[random rapids]

I think I remembering seeing only 3 heart events are available at this point in the game, but does this apply to all NPCs or certain ones? I've seen:
Lily's event 1&2 (have ❤️❤️❤️)
Yuri's 1 (❤️❤️❤️)
Scott's (❤️❤️)
But none for Leah (❤️❤️❤️)