I'd appreciate some input on how to handle one of the things my H has been doing.

My H has always prided himself in being on time. He cannot stand being late. He sees it as disrespectful to others to not show up on time. I agree with all that, which is why his behavior of late has been particularly frustrating. He is very punctual when it comes to doing something for work or meeting his friends. However, he's not so punctual when it comes to commitments he's made to me. Since he moved out, there have been a couple of instances when he'll say he wants us to do something as a family, which is usually dinner at our house. He'll say that he's going to be here at X time, but then show up 10 or 15 minutes late without any explanation. When this occurs, I feel as if I'm unimportant to him. He makes sure he's on time for his other friends, but can't extend that same courtesy to his best friend. If he was just a person who was always late, I don't think it would bother me as much. As it is, I find it pretty insulting. I have said that to him. He always apologizes and says he'll do better. If it happens again, do I say something? Or just act unbothered?