Please listen, go and make a police report, and be truthful and
thorough even if it (may) hurt your pride. In real times of need,
the police are our friends even if a lot of people may not like
them.
It may be tempting to think that this is all not serious, and that
since nothing has happened to you yet, why the rush...but IT IS
IMPORTANT TO LODGE A COMPLAINT and be prepared to give FULL details
of your so called
god-sister', including full name, address, contact number, I/C or
Passport number etc.
The more information you can give, the better.
Incidentally, it may be easier to first PHONE the NPP instead of
going down straight away, as they may have to cross-refer and
re-direct you to another station/investigator etc.
It may save you a lot of time a trouble (if that bothers you) if
you make a few phone calls first.
If, however, you decide to sit on it and wait for something to
happen or try to think of what may happen, then at least let
someone you know and trust fully (or leave a letter with full
details of whatever happened, including ALL details of your god-sis
/ bf) have some sort of reference to look back uopn should
something happen.
Don't get fooled into a false sense of security...MURDERS DO AND
HAVE HAPPENED IN SINGAPORE, OVER AND OVER AGAIN!!! 
