The moment Heero told Ryan White all members in the White Household was killed, he went on a rampage. He attacked Heero to avenge his family as he thought it was Heero who killed his family.
The result was obvious, he got crushed. Ryan White had not fully integrated his bloodline. Except for spitting some fire from his hand and strengthening him physically, he had not learned a single thing about Divine Crow.
That was why he was depressed, he was so down. His family's murderer was right in front of him yet he could not avenge his family. It was so frustrating.
"This is just beyond stupid," Heero also got frustrated. He had tried to explain everything that the friends he was talking about were not his friend but the culprit behind the slaughter. However, Ryan White never listened to him once.