He's being odd with me

I have barely any experience in this department. I really like this guy but I feel like I'm slowly pushing him away. We were sitting In a park, I was laying in his arm.. He was kissing my cheek and neck which was a bit turn on. I kept staring at him and he said it seemed like I wanted to kiss him, I admitted I did. I told him how nervous I was, then he told me to close my eyes and we kissed and afterwards I didn't really say anything, the kiss was nice. I'm just one to really express myself. Afterwards he kinda distanced himself from me, the whole journey home he didnt sit close to me or anything. When he said bye he didn't seem to want to hug me. Usually we are messaging each other by the time I get home but he was so off. I asked him how his day was he said it was ok, it just seemed like I didn't enjoy the park bit. I thought maybe he wasn't feeling the kiss to be honest. I reassured him I had fun and he didnt seem to convinced. I'm no used to this type of attention, he is slowly bringing me out of my shell. I'm just not as loving as he is. . How do I show him how I feel?

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