Cassandra Clare said this quote

I want you to be happy, and him to be happy. And yet when you walk down that aisle to meet him and join yourselves forever you will walk an invisible path of the shards of my heart, Tessa. I would give over my own life for either of yours. I perhaps that when you told me you did not love me my feelings would fall away and atrophy, but they have not. They have grown every day. I love you now more desperately, this moment, than I have ever loved you before, and in an hour I will love you more than that. It is unfair to tell you this, I know, when you can do nothing about it.