ABS-CBN artist Charles King copied viral post from UST Files?

Did ABS-CBN artist Charles King copy a viral post about a failed relationship from The UST Files Facebook page or was he the sender?

The post was actually an open letter from a guy to his ex-girlfriend which narrates a story on how their relationship started, developed, and ended. The writer asked for forgiveness and expressed his love for the girl, saying he still hopes for a second chance.

On Charles' page, the post received over 75,000 reactions and was shared more than 6,000 times.

While on UST Files, the same story written by a certain BigBoy 2012 Music, obtained nearly 9,000 likes and other reactions.

Was it really Charles' love story with Sandra or did he just copy it and repost?