The dream interpretation of a lone butterfly is different from that of a swarm of butterflies. A single butterfly represents happiness and joy. To see several butterflies in a group is bad news. The swarm of butterflies is there to escort a departing soul and this means a death.
In some cultures, a moth is a symbol of a carrier of a recently departed soul. To see a moth in real life is like seeing the return of the soul of a dead person.
A butterfly is delicate. The dream image may include this trait, which is applicable in waking life. In reality, you might encounter a thing or person who is delicate, like a butterfly.