Is he still into me?

I met this guy on an online dating website. Since the very beginning we hit it off quite well, we laughed and shared things in common. Although none of us responded fast to the text messages, I could feel a good vibe about him.

We met in person about two weeks ago, and we had a great time. Nothing happened, but he explicitly said to me that it would be nice to go out again.

Last Saturday, we planned to see each other again and so, we went out again for drinks.
This time we ended up sleeping together and having a fun night.

We spent the next day together outside, and he still was pretty charming and gentleman. Everything worked out really well for me.

But… as soon as we said goodbye at the car, I noticed that this time he did not mentioned anything about going out again. He’s not ignoring my messages or anything, but there’s definitely a change in the vibe in our conversations. Also, it seems like now I have to make an effort to keep the conversation alive with him.

I don’t know what happened, since everything went awesome during our whole date. He even mentioned that he had a great time, but now I’m not sure if he wants to keep dating me and I’m too afraid to start a new conversation with him, because I don’t want to seem too desperate or needy.

What should I do? :( I really like this guy and don’t want to lose him, but I’m not willing to make all the effort (because that would be forcing things out).