My newsletter contains 2 titles, then the body copy.
The repeater duplicates title one in title 2.
How do I get around this problem?
Ideally having more than just title & description would help, perhaps a note.
You currently can't have multiple tokens within a repeating item. This may change in future but you won't know until a formal announcement from CM is made.
Your current workaround is to setup custom templates that mirror exactly what your trying to achieve instead.