Anxiety and scared..

So, my boyfriend and i have been together for 2 weeks, before we got together we talked for a few months on and off. Well we've hung out many times, and finally he came and stayed the night with me. Well before we had the idea to stay together, we talked about sex. I said to him about the past guys ive been with have tried to have sex with me but then leave, which I've only ever had sex with two guys but then i said hes the first guy that's never tried yet... Anyway after i said that, he said well I know when i want a relationship and i want one with you. But when he came to stay we ended up play truth or dare (dirty since i was kinda in the mood.) Then it turned out us being completely naked.. Then i ended up turning him on and then we had sex... I honestly do love him and I don't want us to end. We still cuddled and just acted like it never happened. Then the day after we spent almost all day together. Now my anxiety is taking over and im scared he's gonna leave. I need some advice to help me. I just don't want him to leave me just cause he may have got what he wanted..