Did I make him mad? He doesn't chat with me anymore. Did I hurt him?

[Julie]

I've liked him for a year and we've been friends for a year. He gave me my first kiss about 2 weeks ago, but he said not to get attached, because he doesn't want a relationship. We kissed again a few days later and then we made out at his house two days later. He kissed me when I visited him at his lab and he walked me to my car and we kissed again. We've been kissing privately, not in pubic. I didn't see him yesterday, because I needed a break. Yesterday he called me and asked if I were in school and I said no. I think he was upset. He usually walks me to my car. A few hours later he signs on and chats with me. We talk and then he asks me to call him. We talk some more and well I told him to not kiss me and he told me fine. He added by saying for me to not visit him in his lab anymore and he won't chat with me online as much. I was hurt by what he said. Did he get hurt? Today he signed on and he didn't chat with me. I don't know what do. Should I start the conversation? Is he mad? I didn't mean to hurt him, I'm just scared, because I like him and I didn't want to get too attached when we kissed and stuff. I wish we were in a relationship, because I would feel safe being attached.