Gatsby would never go into hiding at this point in the novel, he has waited a long five years to get this close to Daisy once again. He has succeeded in his plan to be with Daisy, except everything goes very, very wrong in the hotel when Gatsby and Daisy confront Tom, her husband, with their love for each other.
Daisy is a fragile woman emotionally, Tom is an abusive husband and has emotionally abused Daisy with his open affairs and arrogant behavior. Gatsby feels very protective towards Daisy, he waits up all night long thinking that she might need his help. He is committed to her totally.
Daisy is the main reason that Gatsby does not go into hiding. He doesn't care if he is in trouble, in is going to take the blame for the accident any way. He is going to say he was driving to keep Daisy safe.
His love for Daisy is so totally consuming that he doesn't care about himself, he doesn't care what happens to him now. He has amassed wealth and power for one reason, to show Daisy what he has become, to impress her.