50% of all pregnancies naturally abort - in other words miscarry. Most happens before the pregnancy is ever known, but miscarriage is the body's way of letting you know the child was not able to survive the pregnancy.
I am truly sorry that you're having to go through this emotional rollercoaster.
But, it's definitely not his fault. The cervis and uterus are SO protective of the fetus during pregnancy. It just happens to be coincidental.
The recommendations to have him join you for appointments with your OB are the best so you both can understand the medical explanation and, hopefully, reduce your future fears.