The problem is that the .text property ONLY gives text. That's why they named it that.
What you want is rich text, or XHTML. To display rich text, you need a rich text control.
To copy XHTML from one field to another, you cannot simpy use .text or you will get all the tags, etc., as you have already seen.
XHTML is a DOM. You must use code to copy the DOM nodes from one field to another -- accounting for namespace changes if appropriate.
There is no built-in functionality for copying XHTML data from one field to another. You will have to write one yourself.