I don't have anything set in place to do, but you can do it manually like this
$ girl1_message.pop(0) # that would remove the first message in the list for girl1
if you do, keep in mind that since you removed the first message number (0) zero, now message (1) one is the new message (0) zero
it shifts everything below it to fill in the empty space and it can NOT be reversed or put back (the message is burned forever (unless you restart the game)), good way to gaslight your character i guess