i just can't help feeling that the ang moh had been conned to the marriage.
Not by the woman per se, but by his ranging hormones at that time and society programming of reaching certain age must have family and children and love and all these crap. Of course reinforced by the flirting and approved companionship of the pussy, peer pressure of others, etc.
At least he realise fast enough and do a withdrawal but damage has been done to a certain extend on his man freedom.