You are right to be analysing this, OP. We all should do this, but people who have been n abusive relationships more than anyone, IMO.
You can't be too careful - this is your life we are talking about 
Now, the first thing I'd say is that you went to sleeping with him too soon, I think. Hear me out. It's not from a moral point of view I say this (heck, I've had a one night stand myself) but look at this:-
When we hug or kiss a loved one, oxytocin levels increase; hence, oxytocin is often called "the love hormone." In fact, the hormone plays a huge role in all pair bonding. The hormone is greatly stimulated during sex
www.psychologytoday.com/basics/oxytocin
This muddies the waters for a lot of women. It makes it more confusing and harder to analyse and assess the man in question.
Try to put that side of things off for a lot longer next time. In fact, it can also be a good way to help weed out the abusive types who will try to railroad you into sex before you want to.
Now, you have said here:-
on date 2 he was already talking about holidays away
Date 3 I met up and we had sex. It was nice
We met the next day and I just didn't feel right
I didn't want to hold his hand. It felt clammy and sweaty
He'd told his parents about me and all his work friends were excited
little things repulsed me
his clammy skin made my skin crawl
We even took our dating profiles down on date 2
So you met each other for the second time in your lives and you took down your dating profiles and started discussing holidays? That's far, far too soon. You didn't know each other then and you don't know each other now.
The next time you see each other you have sex.
The next time you see each other he repulses you and makes your skin crawl.
By this point, everyone he knows (including work colleagues) know about you and he is posting "smug couple selfies". But you're not a couple - you don't even know each other.
You've gone from thinking you fancy him to becoming repulsed by him in three meetings. I think you know that your whole body and brain is giving you signals that this just isn't right at all.
You sound like a nice person who probably thinks someone has to do something openly bad and awful or you don't have reason enough to finish a relationship. That isn't the case.
Feeling creeped-out or rushed is reason enough.
There is something lacking in this guy IMO if he thinks he is in a deep relationship the second time he meets a woman. Don't you get the impression you could have been anyone really?
It just felt like too much, too fast and too soon
Because it was!!!