The lyrics of this song is telling a story.
The story of a (at first) loving couple.Let's call the guy A and the girl B.

Verse 1:
They loved their other half very much,living happily until one day,A lost all his memory,of course that includes the feelings he originally had for B.Not only he had forgotten B,he had move on*without his memory lar* with another relationship with another girl.
B was very sad(of course lar),she hoped for a hug(a deep and passionate one -_-) from him,even if this he secretly lied to her.(not true feeling)
Chorus 1:(same with OP,the only difference: OP seems like what she did at the moment,and chorus seemed like what she did in the past?(not long after A lost his memory?))
She heck care le-_-;; and kissed the guy(a kiss-goodbye).She felt the kiss was like A is returning to her.(however he didn't).She felt that the next kiss,reunion might be when they were in heaven.A didn't allow both of them to retun to how they were in the past(b'cos he lost his memory!!)Yet she saw his eyes,as if those were filled with tears.
Verse2:
She felt that the love would not end by reminisicng about the past.
However she felt that the love had gone because she might had done too many bad deeds in her past life(retribution?!).She was praying in the church that everything could return.She started to count how long the sweet words would last while looking at the still-prospering celeb world-__-||(she's a celebrity??) and cursed the stupid satilite, that it didn't detect the fact that both of them were no longer the same.
Chorus2:
She felt that even the goodbye they said to each other when they walked passed seemed so fake.However,she still remember the promised they made,to reunite in heaven.All of a sudden-_- she kissed him again?(or is it the kiss she was thinking about?),thinking about how compatible they were in the past.Again,A's eyes seemed to be filled with tears(this A crying baby!!?)
"Please remember to shed a tear on this day every year"
^she told the guy?or she just hope -_-;

My canto is very limited-.-....but the story is still dam sad ok!!!!T^T...I almost cried when imagining the scenes...(and really cried when I read a KA fic(SAD ONE!) featuring the scene of the lyrics while listening to this songT^T)

小城大事LIVE(原唱:杨千嬅)
by:张学友

OP:吻下来 豁出去 这吻别似覆水
再来也许要天上团聚
再回头 你不许 从前多么登对
你何以双眼好像流泪

V1:青春仿佛因我爱你开始
但却令我看破爱这个字
自你患上失忆 便是我扭转命数的事
只因当失忆症发作加深
没记住我但却另有更新蜜运
像狐狸精般 并未允许我步近
无回忆的余生 忘掉往日情人
却又记住移情别爱的命运
无回忆的男人 就算偷呃与瞒骗
抱抱我不过份

C1:吻下来 豁出去 这吻别似覆水
再来也许要天上团聚
再回头 你不许 如曾经不登对
你何以双眼好像流泪

V2:彼此追忆不怕爱会终止
但我大概上世做过太多坏事
能从头开始 跪在教堂说愿意
娱乐行的人影 仍在继续繁荣
我在算着甜言蜜语的寿命
人造的蠢卫星 没探测出我们已 已再见不再认

C2:你下来 我出去 讲再会也心虚
我还记得要天上团聚
吻下来 豁出去 从前多么登对
你何以双眼好像流泪
每年这天记得要流泪

ok - -I'm in the mood of listening to deep and nice voice - -+and he's definitely one good choice~
(chinese pops are kinda awkward...canto isn't that bad!....however Koichi still the best XDDDD*fan girl mood*)

(cough)this song isn't a really good one(HOI !)...I mean the rhythm is average ok |D''(fans don't piak me) but the vocal is of course the best - -+*I've to admit although I'm KK/Koichi's fan*
song is by Jacky Cheung,he sang this song during his concert in 2004(Live ver lei!dam nice sia!),originally by Miriam Yeung.....