J'ai réussi a résoudre le problème par moi même. Le SKRIPT:
command /love:
permission: particle.love
trigger:
if {love.%UUID of player%} is not set:
set {love.%UUID of player%} to true
message "<green>Vous avez bien activé les particules <red>coeur<green> !"
stop trigger
else if {love.%UUID of player%} is true:
set {love.%UUID of player%} to false
message "<green>Vous avez désactivé les particules <red>coeur<green> !"
stop trigger
else if {love.%UUID of player%} is false:
set {love.%UUID of player%} to true
message "<green>Vous avez bien activé les particules <red>coeur<green> !"
stop trigger
on any move:
loop all players:
if {love.%UUID of player%} is true:
show 1 "heart" particles at location of player for loop-player offset by 0.4, 0.7, 0.4
Je met en résolue !