He responded: "Indeedee. Thanks for the congrats.''
Another commented: "Honeymoon in NZ?''
Miss Chuang tweeted: "My 'ex' has got engaged to a girl he just met in Florida! How nice! Should I congratulate him? # Luigi#Wewege.''
She told the Herald Mr Wewege has blocked her from his Facebook page and they were no longer "friends'' online.
She found out about his engagement only after she was told by a friend.
"Luigi blocked me on all the social media sites and I no longer follow him,'' Miss Chuang said.
When asked how she felt about the news, Ms Chuang said: "I actually don't have any feelings either way.''
Mr Wewege denied he had been in a relationship with Ms Chuang, but Facebook messages exchanged by the pair released to the Herald by Miss Chuang showed they appeared to have been together.
In the messages, he had repeatedly asked Miss Chuang to go public about her affair with Mr Brown during the election.
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