To hide something we need to take support of a lie. We can escape at that point by saying so but in the long run, it is always revealed. It's better to face bitterness sooner than later. The reason to be truthful is to be realistic and not harm other people's emotions as one lie can lead to multiple impacts on others' lives as well.
In many cases it's important to not Mask the Fact as it not only worsens the situation but also leads to a breach of trust, mainly this happens with our dear ones as they have a lot of faith in us and just run away from the difficult situation we lie to them and later when they come to know about this they disbelieve us and don't trust us anymore.
The fact of the matter is people do mask the fact on various occasions such as to hide their financial frauds or their personal relationship. Still, in all these situations we are doing so just to protect ourselves for a short time gain and we forget about the long-term pain.