Cassandra Clare said this quote

I did not think you would be angry, Jem burst out, and it was like ice cracking across a frozen waterfall, freeing a torrent. We were engaged, Tessa. A proposal-an offer of marriage-is a promise. A promise to love and care for someone always. I did not mean to break mine to you. But it was that or die. I wanted to wait, to be married to you and live wit you for years, but that wasn't possible. I was dying too fast. I would have given it up-all of it up-to be married to you for a day. A day that would never have come. You are a reminder-a reminder of everything I am losing. The life I will not have.