I'm sorry about your loss in pregnancy - my prayers and thoughts are with you.
Do you own property?
Do you have any children?
Knowingly, if one seeks divorce, there are assets to divide (if there is property) - and there would be child support to pay should there be a child(ren) in the family.
Speculating as to "why" may seem a bit irrelevant at this point.
Fact is what's real. The truth must be found from him only. If he refuses to tell you, you may need to make some changes. Another fact is that no one can tell you how to live your life - what to do, when to do it, how to do it. It's your marriage - it's your husband. Decide what is best for you.
I wish you the best.
Peace, Love & Happiness,
The Mystic Wave