Who is The Man in the Leather Coat on the Balcony Making a Decision from Einstein's Dreams and what is their importance?

In the April 19th dream, a man in a leather coat stands on his balcony, deciding whether to see a woman in Fribourg again. Because in this world, time separates along different paths toward alternate futures at every decision, the man moves along three paths. In one path, he does not go, meets another woman, and lives quietly with her. In another path, he goes to see the woman in Fribourg and lives a tumultuous life with her. In a third path, he goes to see her but does not end up with her.