Never play with someone else's heart. Never hurt them making them fall in love with you, because someday they may come back in your life wanting to do the same to you.
Harry and Ellie finally have a chance. They're both finally free of outside obligations and in a good place. A mental state that makes the relationship they've always wanted to try a possibility. Now that they've decided to take the plunge will the actuality of their romantic involvement be as they always have dreamed? Or have they always been too idealistic? Giving the thought of them unattainable expectations that will ruin them before they begin.