Except she's not a new friend is she?
She is someone he used to work with.
Someone he exchanged innuendo and cheeky messages with.
If someone someone said to me they wanted to be more than FB friends, I'd be under no illusion what the request was and consider it a come on.
She only FB requested him right? Then this means that there was clearly banter or flirting while they worked together. The precedent was already eatablished before it was set in Internet concrete.
The fact that it's only him makes her look better not worse.
Not that it matters, because she could literally have all men in 150mile radius lining up to shag her, that's her business. What is your business is that your h has not excluded himself from the queue.
No, he actively arranged a night when you were out, neglected to mention what he was doing and clearly had lascivious thoughts on his mind so he prepared his car, then had the bollocks to reply dreamily when asked about the receipt
He has minimised every single action. He has you second guessing yourself and falling for the bs that is the wonton woman lured my dh to a rendezvous. He invited her, and paid for it.
Whether he touched her or not, he has conducted an emotional affair right under your nose and now wants you to get over it.
As for you hitting him in the pocket as punishment, it doesn't stop them, it means that the cost of their infidelity, emotional or physical goes up and effectively justifies it in their heads that he did it, got away with it and you're ok with it as you got a bauble.