Did my friend commit adultery and will he need to be stoned to death?

My friend just recently got married. He has been a porn addict for a very long time and thought marriage would fix his addiction issue. However, after the marriage, there was some family issues and his newly wed wife gave less attention to him for some time. This led him to feel depressed and lonely and so he turned to porn again. However, this time around, he has crossed the line a little. He turned to online cam girls and had cybersex with them. He now feels very ashamed and disgusted of his actions and is very worried what consequences he might face due to this. He has not told his wife or anyone except me about this. He is remorseful and is seeking forgiveness from Allah. However, he has some questions: 1. Is this considered fornication because no actual sexual intercourse outside marriage happened. 2. Will he be punished and will it be same as fornication - stoning to death? 3. Will he be forgiven by Allah? What should he do to be granted forgiveness by Allah? Thank you.