It seems you forgot his other son told him clearly his thoughts of him: "he [that man/father] ran away", "I will kill him".
Sleeping with a stranger and a prostitute who resembles his wife, wasn't only on Tyltyl. It's like saying it is normal to sleep with a prostitute but it's outrageous to be a prostitute.
I know that. Mytyl seemed to have forgiven him though... kinda.
I'm not saying it was Tyltyl fault you know. Just thinking it was a pity he turned out to be his father. If only he discovered that earlier though it might be unlikely as he wouldn't have talked about his wife and the crystal.
Of course he had to sleep with the stranger who was his dad :( wonder if he wouldn't have committed suicide if he hadn't...