Joseph: So you said everything he said is based off Shulchan Aruch. Then I called it into question. Then you answered with some Vortlech, but no citations from Shulchan Aruch.
Long story short: You can’t use “Me’od Me’od” to make up whatever you want and call it Yeihareg V’al Ya’avor. The Shulchan Aruch gives a long list of things you can’t do after “Me’od Me’od”. That list is what he is referring to when he says “Me’od Me’od”. He wants nothing flirtatious or overly familiar. “Small talk” in an office setting is not that.
There is no Issur of Libo Gas Bo. Libo Gas Bo is a concept in Hilchos Yichud that makes us remove Heterim that we otherwise use.
According to you, why is it Muttar to date? Because if consistent small talk is Kreivah L’arayos, then someone should be obligated to shoot themselves before going on a fourth (maybe even third) date.
I will B”N look up the Sefer HaChinuch when I get a chance.