This is an opinion question that only you can answer.
Explanation:
It doesn't even have to be very scary. It could just be the time you got lost in a mall and were separated from your parents for a few minutes. It just has to be something that happened to you in real life that kind of freaked you out.
Then, write about if you recovered from it. How did you get better?
That it is Hard being in love, espically when your love leaves you. He is implieing that when your love leaves you, nothing else go's on. There is nothing in this world for you anymore, and you can not even function.