How to add line breaks or bullets in Long text field through groovy?

Summary:

I am trying to include bullet points into a long text field through groovy.

Content (required):

I am having a long text field in lead page where the value will change in each stage. In each stage we are having multiple lines and it is showing like a paragraph. But we want to be in bullet points. For that I have used line breaks (\n) and it is not working in all stages. It is working for the first time only. 

If anyone aware of this please guide me with any approach.

Version (include the version you are using, if applicable):