He's angry that Hawke sacrificed themselves so they were able to escape, that he never was able to tell them how he felt and that soon he has to tell everyone back in Kirkwall about their 'death'. It's been stressful and challenging, but at least he has you and the rest of the Inquisition to help him. He may have lost his best friend, his lost love, but at least he has the support to get on through it. Perhaps new feelings will grow or maybe he'll just get the closure he needs to move on.