No, I have asked him repeatedly and he has said very calmly that he "just didn't do it." (You get free tuition at University here in the UK, plus grants to live on.) One of his infuriating characteristics is that he doesn't feel that he has to give a reason for his behavior, nor (certainly not) apologize; and he does not like to be "lectured"---and he calls "lecturing" any implied or overt criticism. He will simply not take much criticism. In almost all other ways, he is a lot of fun and easy to get along with---loves to cook for himself, me and others, for example.
He could be (subliminally) angry of course, but his Dad (who was English) was very mild mannered and I doubt if he ever raised his voice to him---though he did criticize when my son didn't take exams, for example and would try to reason with him, teach him decent behavior and how to handle money. (!) His Dad was also a very "moral" person, though not religious, but he also had a good sense of humor. My son seemed to handle his father's death well and helped me a lot (emotionally) at the time, but of course lots of things could be repressed. My son and I have, in general, an excellent relationship, but obviously something is not quite right. To his credit, my son has never yelled at me, AND he has been corrected when wrong, all during his life---but not to excess. He had a fairly free childhood (in Spain) but he is an only child if that is significant.
The problem now is that we came back to the US and he started at and has done well at the State University there for one term---started last January. I have had to pay full fees and he understood that he had to work during the summer so that he could present his W2 forms to prove residency in this state to cut his fees in half. His January-June fees, food, and lodging have cost me $20,000 and I am not rich. I have had to come back to the UK to sort out some things here and he (after the end of the Spring term---end of May) just disappeared off the radar and will not answer his phone or my emails. I have just sent one of his roommates some money for my son's share of the utilities; the roommate who is much older says he is OK, and out with friends, but not working. I am very worried, but also displeased about the apparent return of this "pattern." I also just paid off his overdraft here on his bank account here in London (about $2,000.) I did tell him that I was angry about having to pay the overdraft here, (and if I had not done so, the interest would have added up to a terrible amount which he could probably never pay off); again he was not apologetic, said something like "well, thanks," but not much more. My biggest worry is that he won't get in touch, and I like to be in touch. When I am in the same state (until a month ago) he used to call me 4 or 5 times a day to tell me what was going on in his classes, etc. He is quite garrulous---loves to talk in general---practically about everything, but not about his own problems, i.e., not taking his exams, or running out of money, etc. To his credit he usually cooks for himself and he is determined not to have a credit card, and to live within his means now; I hope he is not starving!