Guys, if you had no feelings for a girl and only wanted sex, would you open up to her about your messed up family, and your past?

We met 5 months ago have a sort of complicated past where we were official for a couple days after an intense, way too fast, skip every step thing over summer after we met and wanted each other at first sight. Split, started sex again for 3 out of 4 weekends a month later, he said he did have feelings then but doesn't want a relationship with anyone since he's moving in a year (so am I), then on the 4th week said he had slept with one girl once during that month and he had no feelings for me (again for the moving reason). I ended it and had a rebound ONS, then the next week we spent a ton of quality time together, did end up having sex a few nights and we have an amazing connection. Honestly we seem made for each other (our friend who help set us up after meeting felt the same way all those months ago) and people who saw us were convinced we were in a relationship, "in love", "so cute", and didn't believe me when I said he wasn't my boyfriend, though I don't remember being showing much pda. Things felt different over that week. He told me a lot of personal things, talked about his past, his friends, heavy topics, etc. The sex changed too, he's quite rough normally, but the consecutive nights we spent together this past week we had incredible sex. Ex. he likes choking, and every time he started to he would instead wrap his arm around my head and kiss me me passionately.

I don't see why he'd open up so much if he doesn't have feelings anymore? Even before sex, I was in very sexy VS bra/underwear and he just kept talking about all these personal or random things where normally, he'd hop in bed, I'd turn off the lights, and we'd get started. then the next morning he waited for me to wake up, we hung out for a bit then he deeply kiss me and pulled me into him to continue it when I start to pull away.

It's so odd/confusing to me. I've never had a guy do that before sex.
Guys, if you had no feelings for a girl and only wanted sex, would you open up to her about your messed up family, and your past?
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