He never initiates contact but always responds quickly and enthusiastically?

So I met this guy like 3 weeks ago. At first we texted back and forth every day for few days and then he asked me on a date. The date was great, we didn't kiss but he suggested another date for the upcoming weekend. I said yes and we agreed on movie, it was my pick. We kept texting for few more days and then it all went south... Since he was the first to initiate the last time, after 5 days of radio silence I decided to text him. He responded quickly and the convo was really nice. He even asked me if I went on a date with someone else in the meanwhile and I said no. Then I asked him if we're still up for the movie and he said he's he is just that he's not in the mood these days and that we'll watch it when he gets better. Few days after that I went on a 5 days vacation with my best girl friend (he knew I was going) but he didn't contact me at all while I was there. I posted few pics on Instagram while on a vacation and he liked every single of them, he also liked some stuff I posted on FB, but no word from him. And so I came back and when it has been total of 8 days the last time we talked, I texted him casually. He replied enthusiastically, he asked me how was on my vacation and he again asked if there were any hot guys on the beach trying to hook up with me. I responded honestly that there were plenty but that I wasn't interested. I asked him if he's feeling better now and he said he's feeling great, that he was just partying like crazy these few days and feels exhausted now. This really pissed me off, so he's feeling great, partying and shit, but makes no effort or time to pick a goddamn phone to contact me or to set up a second date, he knows I was waiting for him to "get better". So I just left him on "seen" yesterday and I'm not planing to text him first ever again. What do you think it's his deal? Maybe he friendzoned me?
He never initiates contact but always responds quickly and enthusiastically?
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