Toxic people systematically destroy others because if they can not bask in the light then no one else deserves to. Lost people suffer in their darkness, happily dragging your light down into their personal hell so you can listen to all their woes. Soulless people, lacking empathy, suck the light from others to taste that which they can never understand. People can't be helped until they want to be helped. You can't be there for others who need you, if any one of these types destroy you. Save yourself... it's not a sin to love from a distance.