What do white butterflies symbolize?

I keep seeing white butterflies everywhere! I first noticed one at my parents house which is far away, a while ago. They don't get close to me, but they are always within sight. During that time I was doing a cleansing ritual because I had a negative energy latched onto me. And just now, I was doing a full moon ritual to rid myself of bad habits and I look up to see another white butterfly fly within eyesight on a bush. It lingered for a moment then flew away..

I googled it and some believe it is a soul of the departed looking after you, HOWEVER, no one close to me has died. I wish it would land on me next time so I can talk to it.