Diabetes II can usually be regulated with physical activity at first. After a while (looong while for some) the person has to regulate it with medication. After a new period, small or long, a new medication has to be added to the first one. If it's still not well regulated one will probably have to start to use insulin.
Since, the way I have understood you, your husband's blood sugar is beneath 7 mool/L after 2 hours after a meal, he is OK. The procedure is to measure right before meal and two hours after meal. The blood sugar usually goes up 2 hours after a meal. Since physical activity lower the blood sugar, may be he will feel more in control if he takes a walk or some other physical activity and then measure it again. My GP says from 6 - 10 after meals is inside the normal range. I try to keep it beneath 8 after meals.
PS. Stress over time might make the blood sugar to be higher than it used to be. If his blood sugar falls outside of normal range after meals he, either it is this or that that caused it, he has to visit his GP to discuss if he shall make a change in medication.