Struggling with intimacy in my relationship

I'm really struggling in my relationship. we are getting married in May and I love him more than I can even explain but its been hard recently. the begining was amazing, we'd be having sex as often as we could but slowly intimacy and sex has been sparse and rare. I thought he just had a low sex drive and maybe it was the initial spark that had made him want it more at the start. I have a high sex drive and sometimes I question whether it's me thats the problem? He's recently opened up to me about experiencing sexual assault in his last serious relationship and it makes it hard for him to be intimate because it brings back some bad memories. which I totally understand and I've been trying to support and be there for him. I feel selfish and guilty for feeling this way because of what he's endured. some rdm background I was assaulted when I was 16 but I suppose its effected me differently. As much as I know why this is happening, it's still hard not to take it personally. like, I want him to want to rip my clothes off and to be risky and adventurous, but even when we do have sex it's strange. he won't make eye contact with me, and there's no foreplay or anything different. It's like he's only doing it to fulfill a primal need and then he's done and that's it... sorry for rambling I'm just very confused and feeling down right now.