Originally Posted by ChrisGinsburg
I'm curious how you came to know this as fact?
Actually I don't. I found the statement in a casual line in a brief article discussing Albert's life.
That period of time (1901 to 1904) had various ups and downs for Einstein. He may have been depressed over other things. For example, this was the time when he got his non-Jewish girlfriend Mileva pregnant, and Einstein's mum objected strongly to them getting married.
Baby Lieserl was born, and Einstein was not there. He wrote many letters. Eventually Lieserl, his illegitimate daughter, died at a young age from scarlet fever.