Alex explains she will always be "his person," but he found a reason to stay away that he couldn't ignore.
He apologizes for leaving via a letter and reveals he is filing for divorce. He leaves her his shares in Grey Sloan Memorial Hospital. Grey's Anatomy s16e16
He discovered that Izzie used the embryos they froze years ago when she had cancer. Alex explains she will always be "his person,"
He expresses his gratitude for their mentorship over the years. The Big Reveal: Izzie Stevens and the Twins Grey's Anatomy s16e16