There was no point in saying 'I love you'. Olivia was never the one to ask for words. She did however ask for actions. So he did everything he could for her. He put at stake his free time, his money, his life. No one could tell whether it'll help.
Peter was a patient man. He could wait for years, had he wished for something strongly enough. And Olivia was definitely worth waiting for. She was the bright side of his life, always doing things in the name of the greater good. Hell, he never believed in it in the first place.
But for her he would. He would answer her calls in the middle of the night, wait for her and be a good person. Well, as good as he could become, anyway.
There was no telling how long will it take. So all he could do is sit. And perhaps buy a donut or two to ease his hunger.