Is there a major change in character of People who go abroad for work?

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One of my friend went abroad for work few years back...He was a nice chap who respected his parents much...He usually goes to the temple everyday when he was here and he was also good at studies...He was very much indian and followed the indian culture perfectly much to the awe of other ppl......He got a good job offer abroad and he went for it...years later I couldn't believe wen i saw him...He was very much changed...the change was rather bad...He didn't talk to his parents as before and often used to get frustrated with them abusing them over phone whenever he talked He also didnt talk much to me treating me like a third person....They also found that he had had several relationships abroad with girls and he turned out to be a big flirt...He,Who had been a teetotaler, couldn't pass a day without having alcohol and he's become a chain smoker...Can ppl change just like that....he couldn't hold onto the values he'd been taught at home values he followed till he was in India....why is it like this?