Honestly, with that reading I think she didn't tell him, because she didn't want to be a burden to him, especially when he got somewhat "successful". She only told him after she was dying, knew she couldn't abuse him for long, if ever. On top of that, where would the sun actually have gone? Doubt her relationship with her parents or her family was anywhere close to stable, so she chose someone she knew would love and care for the child. The other option probably would've been foster care, which, as most probably know, is a horrible experience