I need some info before I can make sense of your predicaments:
1. Why are you so sure that you will part/break up when you leave Singapore? (Are you not going to keep a good thing going?)
2. What do you want out of this relationship besides a "sweet" 4-5 months before you leave? (Do you see any kind of future for both of you? Or are you just afraid of being alone?)
3. What do you have to offer to the girl during these few months? (Will you be her friend, her lover, her confidante? Will you cease to be these went you leave?)
These are a few details that you need to get straight before even approaching the girl. What she thinks, feels and wants, is a totally different story altogether, and since you have no control over these, there's no point in worrying about it.
Hope that you and the girl are on the same wave-length on what the word LOVE means. It is over-used and often abused.