<human>: A little backstory: I was in a long relationship that ended this summer. A little after, I met a guy online, and we ended up getting wasted and having sex. We went on a couple dates after and had sex a couple more times. The whole thing lasted a week and a half, but we weren't compatible, so I stopped talking to him. That was the only time I've ever done something like that. 

About a month later, I met my current SO. The first time we hung out I knew that he was different and I immediately started falling for him. The first time we did anything sexual was a week later. 

My SO can't get over that I had sex with someone on the first night, and tells me that he doesn't like to think of his girlfriend as 'easy'. His thinking this is causing a lot of strife in our relationship, and I don't know how to help him get over it. 

I have apologized and he knows I regret that that happened. I don't see myself as easy, it was just a mistake and I ended it. And I think me waiting to do anything sexual with him, proves that I'm not easy. 

My SO is amazing, and I would be heartbroken if we weren't together. 

Is he right for thinking I'm easy and not being able to move past it?  How can I help him get over this?

Give me a shortened version of the text
<bot>: had sex on the first night with someone, met current SO a month after that, but SO can't get over the fact I had sex with someone on the first night