How about other lies that you uses because you can't admit to yourself that you've actually lost because it's a sign of weakness?
Yes Ive lied before but not to hurt anyone, it was more to protect them and myself from the shame of admitting how much I really lost. Sometimes Id say I only lost $50 when it was actually over than that or claim I lent money or my paycheck was short, just to buy time and avoid disappointment. It wasnt about betrayal, but about hiding a weakness I wasnt ready to face. I guess everyone have the same dillemma or prolly doesnt just want to let it out since its gambling related and you fear they wont understand.