Based on the letter, Henry and Beatrice were most displeased with him, and he could see why, given that they didn’t have all the facts. But he also couldn’t give them all the facts. He couldn’t possibly explain that he had only just determined to court Riddle, inspired by a hideous accident resulting from his own lapsed judgement and ignorance – and Malfoy being a prick – and solidified by his desire to keep a reign on Riddle. As far as Henry and Beatrice would ever know, it really was a love match and he and Riddle had been courting for some time.