<human>: Can you provide a brief rundown of the text in within 3 sentences?

So some back story, we have only been official for a few weeks but been seeing each other since mid May. He and his ex were together for 5 years, they lived together, but she is now married to someone else.  I think they broke up about a year ago. He said he is over her.

We were at the beach with my family and the two of us decided to take trip to a city about an hour from where we were staying. We ended up renting a hotel room because we had both been drinking.  In this city you can take drinks to go, so we were exploring and getting drunk, it was a lot of fun. 

We decided to call it a night around 1 am and headed back to the hotel. By this point we were both drunk, him way more than me. We get back to the room and start having sex and its all going great. He moaned her name (we have very different names). I don't think he realized he did it until I called him out on it. He apologized and told me I was the only girl that he wanted, I went into the bathroom because I needed a few minutes to myself.

The next morning he didn't remember that happening, when I told him what had happened his face fell and he apologized again and said the same things as he did the night before.

I'm not really sure how I feel about it. I believed him when he said he was over her, but now I'm feeling a little insecure.  Has this happened to any of you all before? How did you get past it? Do you think he is over his ex like he says he is?
<bot>: My boyfriend moaned his ex-girlfriends name during sex while we were drunk. Has this happened to any of you all before? How do I get past it?