Sex for the first time

So me and my bf we started to make out and play around and then he asked me if I wanted to have sex and I said yes, keep in mind I was still a Virgin and I told him that before anything happened. So we ended up doing it. After we were done I ended up crying and I couldn’t control it.

I don’t know what happened? My boyfriend was so nice that when he saw me crying he was trying to cheer me up and he hugged me a lot. Of course he asked what was wrong, but I didn’t know what to tell him because idk why I ended up crying. Idk if it was because it was my first time and it did hurt or because of something els.