I think he is showing very clearly how he copes with "heavy" stuff, I think you're feeling confused because you're seeing clearly that his way of coping makes you feel dismissed/invalidated.
If it makes you feel any better... I have an awful background too and have had to tell my current partner about certain aspects of it. It is an incredibly awkward thing to do ime. I never know how much to reveal when, feel acutely sorry for the person I am telling because of how dreadfully upsetting it can be for the listener, etc.
As a general rule I try to put it off as much as possible. In your situation, with the film being suggested that would trigger you, I would have done the same no matter how early in the rs. You have to be who you are, to own your history and not be ashamed of it. He needs to fit in, or (and I mean this kindly), fuck off.
I told my partner that I was a CSA survivor when we had known each other only a couple of weeks. I had to because he made an off colour, black humour sort of remark and I was massively triggered by it and just had to say "sorry you can't say that around me because xyz". He was absolutely mortified, he went white as a sheet but to his credit did not swerve away. In a clumsy way he explained that he had other female friends who had experienced CSA and he loves and supports them (this was his way of attempting to say he did not think I was a freak and that he empathised with me) and that he was sorry to have said something so insensitive when he barely knew me.
That's the kind of response (even if clumsy) that a survivor generally needs to hear imo. And that was when we weren't even really dating yet, he was a lay I found on Tinder, at the time! Has since blossomed into something much more !!
Even now (have shagged dated him for about 18 months and we made things official 6-7 months ago) if I have to reveal a detail to him about my history, while he may respond awkwardly at times, it's never in a way that feels dismissive or ignoring. And he tries to make up for it if he has been really awkward (bless him)
The body image stuff, the lack of compliments and so on, that's not how it's meant to be. Your bf should think you're gorgeous, and while he needn't tell you in words, you should be able to feel his approval of you seeping out of his every pore! It's not meant to feel anything different from that.
I don't think this guy is really for you. Everyone has needs and a history and sensitivities. You can find another man who is OK with you and the unique mix of qualities (and past experiences) that make you you.
It's not meant to be this hard!
Keep seeing him if you really want to, but I'd dial it RIGHT back and give lots of space for you to be you and him to be him.
Sending you love OP, it's not easy being a survivor and navigating all this.