I (27F) had intimate relations with my fiancé (25M) after drinking and I can't recall what happened. Now he's placing blame on me for it.

Recently, I (27F) and my fiancé (26M) visited my sister's family. I hadn't intended to drink, but with everyone else partaking, I decided to join in. I had four drinks, which typically wouldn't leave me hungover. However, I hadn't eaten much that day, and while I felt fine when I left, it hit me hard once I got home. I woke up the next day with significant memory loss, which was unusual for me. When I asked my fiancé how the night ended, he got angry. I wasn’t sure if we had sex or if I had washed my hair, but it turned out I did both. After he calmed down, he explained that we had indeed had sex and that I was the one who initiated it. I didn't dwell on the incident much and went to a two-day work meeting. Although I wasn’t hungover, I thought I just reacted strangely to the alcohol. Later, around 5 PM, while I was still at the meeting, my fiancé told me he got drunk and cried. When I asked what triggered this, he said nothing in particular, and I suggested that sometimes it's therapeutic to let it all out. My team had a gathering that evening, but I was sleep-deprived and still recovering from the previous night, so I left at 10 PM and went to bed. When I returned home the next day, my fiancé started recounting details about the sex we had, emphasizing that it was my idea. He mentioned he tried to help me sleep but that I refused. I felt a bit confused; it wasn’t like he had assaulted me, and I knew I had wanted it. However, he kept insisting that I seemed lifeless but was still eager for sex, which made me uncomfortable. I couldn't remember anything and that bothered me. If I truly seemed lifeless, I questioned why he would consent to rough or anal sex without my usual preparation. As the conversation continued, he expressed concerns that I might get drunk again and sleep with someone else, jeopardizing our relationship. I couldn’t understand why he would think I wanted to be with anyone else. In my younger years, I drank a lot and never had a one-night stand; I have no interest in casual sex and need a strong emotional connection to consider being intimate with someone. My fiancé has known me for 2.5 years, and we’ve shared our phones without any issues. I've never shown interest in anyone else during our relationship, and it pains me that this situation made him doubt my commitment. I recognize that anyone can get too drunk; it wasn't intentional on my part. I hadn’t even consumed that much, and now he’s accusing me of potential infidelity while intoxicated. I’m feeling very conflicted about all of this. It’s worth noting that he hadn’t been drinking at all that day. I’m unsure how to handle this situation, and I’d appreciate any advice you might have.