Morning all.
Sponge have nothing to contribute that hasn't already been said except to say your post was very eloquent and left me in no doubt that some Weird Shit is at work here, and it's not you. Well it is insofar as you are clearly too good for the lot of them, and they know it. As for LC, it doesn't really matter what was said or done, the fact is he said all manner of smooshy mush then asked for a naked picture. He gave a smooth reply when you called him on it, and then, in a nutshell, fucked off. Nice.
I learned pretty quickly that it doesn't matter what dizzy heights were reached during an initial date in terms of word or deed, you need a day or two to process afterwards, away from the influence of alcohol/pheremones/etc.
You just don't know who is a person is right away, or if the connection you make with them, if any , has the potential to last.
I am a big fan of doing the whole thing sober (easy for me I know, as I don't drink alcohol) and taking a big step back from anything physical until I felt the time was right. I spoke up about it from the start so DP didn't think it was him. I didn't even greet him with a peck on the cheek, which he took as non-interest till I explained why.
The reason I was so cautious is because of ex and the overpowering effect he had on me at the start of the relationship. I was so smitten by his alpha maleness that I ignored my churning guts and better judgement. So I took it slowly with DP, made sure I felt comfortable with him, tested his responses to my reticence, then made a move pounced on him Luckily the chemistry was there but it might not have been.
Conversely if you start off with chemistry don't assume you're automatically heading for happy-ever-after. Just IME and IMHO.
Watch Happy to hold your hand and hoping for a good outcome. Congrats on the job too
Bant see above for my take on alcohol and dating. I think you sound like a pretty good catch tbh 
No time to comment on you all, but good advice all round.