Depends if messages are stored to phone / sim / memory card. You could:
get a new screen
or
if your messages are stored to sim - take the sim card out and copy it to your pc via a sim card reader (data storage device) which are dirt cheap
or
if messages are stored on memory card, copy it to pc with a similar device as above
or
try and remember what buttons you needed to press to send address book via bluetooth to another phone
or
look up on google how to set your phone to divert calls to another number (hopefully you will find diagrams or detailed instructions because you can't see what to go to on your screen) you will then be able to read all future texts so long as you've got another number to divert it to
or
call nokia or service provider or phone shop to ask for suggestions
or
just give up on ever reading texts again and sell your phone via the internet to one of the companies who pay you for old phones so they can recyle them
or
stomp sh*t out of it in a fit of rage (this will at least make you feel a bit better)