@Heccikage I don't, no. Breaking somebody with a lie like that? That's just cruel, and may hurt them more than the pain of staying around you.
There is a choice to be strong and true. To say, "I don't believe I am healthy for you, so I must step away". If the person does not agree and persists in trying to communicate with you, you can ALWAYS refuse to engage. It may hurt in the short term, but people tend to understand and heal better from painful truths, and grow from them.
This is a tangent but has some bearing; I personally feel that, being aware of toxicity, an element of responsibility also lies with the person you try to break from. Some people can be aware that another is unhealthy for them, and if they are 100% informed and knowledgeable about that then they absolutely have the right to continue to choose that person. By doing what you suggest, you take away their freedom of choice - and I would suggest that is disrespecting them.