Gambling doesn't make people bad. The majority of people who gamble, be it occasionally or regularly, do it just for fun and don't have a problem. There are around 2% of the population who gamble to problem levels, but each of those people affect the lives of many others. Often parents/partners/firends etc only find out that gambling is a problem when things have become so bad that it seems there's no way out. Debt can have been mounting, hidden behind lies and stories of bad luck (the bank made a mistake, I was robbed, I lost my wallet/purse/phone), and the gambler will play every trick in the book to get what they want. More gambling.
Its not really about the money (It may be at the start, and some people will continue to believe it is). Its about a desired effect - a buzz which is comparable with drug use. Some people are going for the excitement buzz, some more for escapism. Some people just want to feel something- Anything.
Lies may help get people off their back for a while, but they lead to breakdown of communications and trust. Often gamblers hate lying, hate being lied to, hate lyers, and hate themselves for being what they hate.
They will not change until forced by circumstances to do so. They will not tell you about a problem while they think they can deal with it without you finding out.
They may well love you, but will tell themselves that they are only lying to protect you from overreacting and will probably view everybody else as being the ones with the problems. Until it comes crashing down. Believe it or not many gamblers actually hope they will be caught for ages before they are, and may well gamble more compulsively so they will be caught and the struggle will be over.
IT MAY BE DIFFICULT TO WATCH SOMEONE YOU LOVE GO THROUGH DIFFICULT TIMES, BUT UNDER NO CIRCUMSTANCES SHOULD YOU PROTECT THEM FROM THE CONSEQUENCES OF THEIR ACTIONS - IT WILL ONLY MAKE THINGS WORSE. Its not about punishment, its about consequences. Without consequences there will be no change