I'm so perplexed and need advice (or maybe a slap/reality check).
Over the last month or so of last year got very close to a friend that had previously been platonic. Nothing physical but it got very intense - he'd contact me almost every day, he initiated frequent catch ups, he said he loved me (and acted like that was true), he said all sorts of other things about my value to him. It was all very intense, and then we both went on holiday, making vague plans to see each other when we got back. Still heard from him fairly frequently, nice messages etc, including one last Saturday night quite late at night that I didn't respond to as I was already asleep. I've no idea why he messaged then or what he was doing.
I replied the next day when I got the message upon waking, and he left me on read - read it but didn't respond. I sent a follow up asking if everything was OK (it wasn't like him not to reply) which he replied to but didn't really engage in proper conversation then left the conversation. I then gave him the benefit of the doubt so messaged a long Happy New Year message, which wasn't even opened for over 24 hours then a short "happy new year" response without engaging in any chat, and then my reply to his message was ignored.
I feel like I'm watching something slip away but have no idea what. I'm just bewildered. WTF has happened? He's been online a lot but i can't message him anymore without feeling like a stalker 
Has anyone been in this position before?