Was it cheating?

J

So I had sex for the very first time last month with someone I met years ago in college and then reconnected with and had been talking to for months. He knew I was a virgin and it was a major step and he made that night (technically our second date) really special. I assumed we wouldn’t be seeing other people obviously. But the next weekend when I was at his place I saw lipstick and other “girl” evidence in his trash can...it really upset me but we had not had the conversation about being exclusive. That night I told him I wouldn’t sleep with someone who was sleeping with someone else and he was a little hesitate to agree to be exclusive because we only see each other 1-2 time a week (and he has a very high sex drive) but he eventually agreed. The thing is he’s mildly autistic, so he thinks of it more as he had a physical want and he did it. He told me it was just physical with other people he had been with. But considering what a big step it was for me and how vulnerable I was and how serious he seemed about us it really bothers me that the week after he took my virginity he slept with someone else and didn’t say anything. This was about a month ago now but it’s been bothering me and I’m going to bring it up this weekend. But do I have a right to be upset if we hadn’t talked about being exclusive?