<human>: Can you give me a shortened version of the text?

Hello /r/relationships!

I met a guy a little over a month ago on a dating app and we've been talking a lot. We like each other and have a lot in common. We plan on meeting next month as we live in different cities. We have sort of drunken sexted yesterday (that's something I wanted to avoid before our meeting, but fuck it, it happened and can't be erased. And it was actually fun!)

He told me how he wanted to put his hand around my neck then kiss me. I'm fine with the kisses, but not with the hand around the neck as it reminds me of a time I was hurt by someone I cared deeply about. I started therapy half a year ago and it helped me tremendously, but I can't deal with this gesture yet. 

I remember a fling once put both his hands around my neck to kiss me, and I couldn't help but to push him away because it felt awful. He then asked me for an explanation, and I guess it was way too early to open that emotional backpack of mine. I don't want to repeat the same mistake. 

Can you guys advise me on how to tell him to avoid touching me there ? When should I do it ?
<bot>: Sexted with a guy I like, and I don't know how to ask him not to put his hand around my neck as he had suggested, because PTSD ensues.