Due to the stigma attached to gambling, most persons by default wants to hide their gambling habit from their partner especially when they know their partner is a very hyper active and repulsive person, and such partner cannot handle such information about  their other partner in most cases, that alone gets them to want to keep hiding their gambling activities so as not to cause any form of uproar in the family or pit their relationship on the line.

But all of this is not excuse enough because if you hold onto those excuse to hide your gambling behavior, eventually you will get exposed and loose out in your relationship in some cases so it is best to come clean amd inform your partner soyou don't have to battle it in the nears future and cause issues you would have prevented much earlier