What is the ruling on saying: "Life is separation" or "Life is parting," and what follows from that in terms of doubt regarding the intention of divorce?

What you uttered, "The world is separation," does not divorce your wife, even if the thought crossed your mind at the time of utterance. The word "separation," whether it is a euphemism or explicit for divorce, requires that it be attributed to the wife, such as a man saying to his wife, "I have separated from you." So, do not trouble yourself with these doubts.