You cannot lose your interest in the house unless you sign a deed over to someone else for your interest.
This, his filing of bankruptcy will not take away your interest. Also, because he's filed a chapter 13 (which is a reorganization of debt and not a liquidation), the property should not be subject to being lost or sold because a chapter 13 debtor gets to keep all property.
However, even in some situation where the property was at risk to a creditor or the bankruptcy court
, ONLY his 1/2 interest would be subject to the being sold - not yours. You would be entitled to your 1/2 interest.
Also, if there's a court order that designates him to transfer his interest to you, then it could be considered as a form of alimony - which could make the property immune from being subject to the bankruptcy.
You may want to consult your divorce attorney about the bankruptcy and also about filing a proof of claim
for your interest in and claim to the property based on the divorce decree and property division agreement.