It is sad to hear your predicament but I am not sorry nor surprise at all. These PRC WG's go to Singapore to make money. That is all to it. They are trying to use the shorest time they have to make the most money they could. If you tell them you like or love them, you will be in big trouble. I have seen families being broken up, people going bankrupt/broke and kinship turned to a feud. Some even had their retirement fund sucked dried by these "Hot Babe" plying their trade in KTV's, PUB's and Whorehouses (Geylang). Sometimes, you even wonder, who is the 'Real' predator and prey.
IMO - You are in this state because you are naive and gullible. I am sure such cases/matters is not only isolated to Singapore. I am sure, there are many similar cases in Malaysia, Hong Kong, Thailand and where ever there is a healthy Chinese Community. However, you are a brave person to have admitted your mistake and hopefully, you will move on and forget about her.
I said you are naive, why? How did you get to know her? Did you meet through a mutual friend at a cocktail party?
No! I presumed! You went to Geylang Lorong's to look for commercial sex because you were horny and lusty, picked her out of a line-up's of whores. You knew she is a prostitute and you had fallen for her, WHY? Why did you fall for you? You can't blame anyone but yourself.
Look! There are even newspaper articles being published about yours and such things happening in Sillypore. Sometimes, I blame the Government for taking "Too Much" care of Sillyporean. Affleunt and well educated Sillyporean they may be, Sillyporean are too soft and not used to the pragmatism or the realism of life in China, especially the new generation of the eighties borned, life is Sillypore is easy compared to her neighbouring Countries. Like I said, you have yourself to blame. Stop complaining and move on. Once you tell yourself you loved her, it is the beginning of countless sad events. She will bleed you dry and cause you to have sleepless nights. Not only that, you will not be able to concentrate on work and there goes your job and career.
I have heard many stories about these Dragon Ladies (小龙女). They are substantially stronger mentally than most people from a more developed Country like Sillypore, Malaysia and in Hong Kong. They will endeavour/fight to the last and their determination is unquestionable. Importantly, most of them are shameless. All they want is cash and material goods. Integrity and pride is last on their mind. They travel aboard to make money. Not for Holiday or to visit you. Just to make lots of Cash in order to start a better life in their native land. With the money made, they will start a small business and buy lands and houses (the smarter ones) some will go back to square and like you said, take drugs and have gigolos.
My advice - Man-To-Man: Please forget about her and move on. Your life will be much better without her. Afterall, she is just a Whore!
I am quoting our famous 'Ah Sam' - please take a good look!
3 Simple rules for Whoremongers.
1. All you need to know about any whore is how to contact her if you want a professional fuck. No other personal details should be sought. If they volunteer to tell you their life stories, tell them you are NOT interested.
2. There should be NO contact with whores beyond their professional capacity.
3. Whores are for fucking and that's it. They are NOT for loving or marrying. They are NOT dinner dates or persons you exchanging inane SMS messages with. They are NOT there for companionship or friendly chit chat after a fuck. Just fuck them, pay them and leave them.