The 27-year-old Malaysian was sentenced to six weeks' jail on Thursday (Jan 14) .
He had been convicted in December last year of one count of voluntarily causing hurt and two charges of criminal intimidation.
The man and his victim cannot be identified due to a gag order to protect the woman's identity.
Court documents state that they became a couple in mid-2018. But by Nov 29 that year, they had broken up.
In her written submissions, Deputy Public Prosecutor Shana Poon said that the man was unhappy with his victim over the break-up.
"This was a relationship which was marked by considerable inequality in power - the accused did not like (the woman) using social media, made her write down 'mistakes' he thought she had made, and agreed that (the woman) was the one who was begging for his affection and attention," added the DPP.