[i-134] Should I co-sponsor my sister's fiance?

My sister asked me to co-sponsor her fiance who currently lives in Romania. She started the Fiance Visa process in August 2017 when she left her job in the States and went to stay with him in Romania. Although I told her multiple times that it would be better if she stayed here and worked, she did not take my advice. Now she has no income and wants me to co-sponsor her fiance.

Before I go any further, I know the i-134 form is NOT a legally binding contract. However, what are my obligations as a co-sponsor?

The reason I am skeptical in signing the form is because the guy (25 years old) has never worked in his life. When my sister went to stay with him, they ran through her savings and she is now over $6,000 in credit card debts. I have asked him to find work multiple times (my sister cannot find work there because she doesn't speak Romanian) but he says he is "too depressed to work." He says he is not in a good mental state and needs to come to America to find a peace of mind. Although he has promised that he is willing to work even two jobs once he comes here, my first thought is that if he won't work in his birth-country, why would he work here? His depression would magically go away?

As a side note, the time when my sister met her fiance on Instagram last year was definitely a difficult time for my family. None of us like the guy and he has not shown any likable qualities.

So here are a few of my questions:

• What are my obligations if he refuses to work?
• Can I leave the country and live elsewhere or am I obligated to stay in the US as long as I am a co-sponsor?
• Am I forced to let them live with me if/when they come to the States if they cannot afford housing?
• Is there any risk in co-sponsoring a guy I do not know or even like?

Thanks!