Oliver loses someone he loves and can't deal with the grief it causes. He needs help from everyone around him to truly be able to deal with the situation. Through this he might find someone he never noticed before.
Oliver is getting used to it. Hit her head and she lose her memories. For the second time, she forgets about him and he's still as determined to make her remember. Only she ran away before he can properly talk to her. Would he find her again? Would he be able to make her remember him again?