To paraphrase Jesse, Some straight is not all of a sudden just gonna break bad.
The situation at home is not much better.
His pregnant wife, Skyler, is always complaining about something and speaks to Walter in a degrading manner.

AMC
This is evidenced when the teen is busted for trying to purchase alcohol with his friends.
Instead of calling his actual father, Walter Jr. calls Hank and pretends he is his dad.
Meanwhile, Walters family eventually learns about his cancer diagnosis.

Skyler becomes insufferable and criticizes Walter for his choice because she only thinks about herself.
Everything that happened after that was almost always out of Walters control.
During the second half of Season 5, Hank finally realizes that Walter is Heisenberg.
Since he has no actual proof, Hank attempts to force Skyler to turn on her husband.
When that doesnt work, Marie talks to her sister and tries to kidnap Holly.
This is a stark contrast to Walter, who even killed to protect his brother-in-law.
The Breaking Point
Walters biggest breaking point comes when he realizes that Jesse has turned against him.
He decides to give himself up.
Walter eventually leaves his home with the intention of disappearing.
Walt arranges to meet Jack and his men, who he kills with a remotely operated machine gun.
They share a final look before Jesse drives away.
Walt, the series tragic victim, admires Jacks meth lab before dying from his injuries.