Well, he is really lucky to have a supportive partner who has the initiative and gumption to get more info as it is a condition which can have an impact on the whole family and not just the individual. It can be a fine balance as a carer/partner between being supportive and interfering so you might find yourself walking a tight rope occasionally. Good communication will be important. Many diabetics, particularly Type 1s have no idea of the impact their condition has on others and we have had a few members joined for advice and support because they were stressed and traumatised by a loved ones hypos, particularly if they were becoming frequent.
Do you know if he is on multiple daily injections (MDI) or a pump...which is a small device attached to the body which delivers tiny amounts of insulin throughout the day and night? Does he finger prick to test his BG before meals and at bedtime.... or does he not bother ..... or does he have a sensor on his arm which he can scan to get a reading.... this is called a Freestyle Libre and is a great bit of kit. It is gradually becoming more available on the NHS and really can be a game changer for helping you manage your diabetes.... He may not be aware of these technologies if he doesn't get much input from his Health Care Professionals.
Anyway, lovely to have you on board and I hope we are able to help you to help him.