Boyfriend-zoned him, what does that even mean? In the beginning he was being more than friendly, I can tell you. In the party he actively pursued me and when I said I had to leave (quite early) he offered to walk me home etc. I wasn't the one who made the moves. He wouldn't have had to do any of that if he just wanted to be friendly. Hell, there were tons of other girls in the room he could have talked to and leave me sit on my own in the corner as we were all complete strangers to each other at that point. For some days later, of all the other girls, he seemed eager to seek my company again.

... until making that more or less gradual 180 degree turn, starting to espace situations where we could talk, acting passively during conversations, avoiding eye contact, acting distant all in all. It was weird because it was so different to his earlier behaviour. I couldn't sleep at night because I just couldn't understand what I had done wrong. However, after finding his girlfriend he made another 180 degrees turn and started acting friendly towards me again and seeking to talk to me again. So, in his books I wasn't a horrible person to avoid completely after all... just not girlfriend material?

Of course I felt disappointed. He had lead me on to think he was romantically interested in me and then he friendzoned me in what initially seemed like he zoned me out completely (even his circle of friends)! Can you really blame me for not being that excited to hang around with him and his girfriend later on?

Now that I write this, I understand my experience wasn't exactly similar to OP's so I apologize for detrailing her topic. I thought that by sharing I'd help her not feel so alone, as we both had our hopes built up and then crushed. But what the hell, I made a mistake I guess... so I'm sorry.