A quick glance at the OP's topic started history lets us see that this is either fake or that he's been missing the writing on the wall for a considerable amount of time.
To wit:
August 8, 2013: "Last night drinks with friends turned weird": TLDR: He was hitting it off with a girl at the bar, went to take a piss, came back to find one of his female friends making out with the girl. Threesome jokes made by multiple posters.
February 12, 2015: "Going on a date with a sure thing." TLDR: He has a date with a divorced sloot, she wants the D, he's not sure where to take her on a date.
December 12, 2016: "I smell T.R.O.U.B.L.E.": TLDR. He's in a relationship with someone who has a lot in common with him. Doesn't know what to do. Threesome jokes made by multiple posters.
March 8, 2018: "Dating Question." TLDR: He wants to know if it's weird to date someone who is dating someone else. Jeez man, cmon.
January 3, 2019: "Polyamorous Couples": TLDR, He wants to know if anyone identifies at polyamorous and if so, how did they bring it up to their partner. Posters are not very nice, but very funny.
March 21, 2019: "Married Folks": TLDR, asks people about prenups.
May 6, 2019: "Over a year into dating": He brags about having sex 3 times a week.