Why is he doing this to my brain?

My ex who I am still completely in love with messaged me last night while I was out at an event.

We met up last week and got along so well. There was still attraction, flirting, friendship and it made me miss him so much. He said that he had a really great time hanging out with me and i thought that maybe it would mean we could be friends! However, I have barely heard from him since. He will send a snap chat and then not reply to my reply, he hasn't messaged or shown any interest in being a part of my life. So I gave up.

Anyway, last night I was at an event and had on my story a video of some act that was on at it. He messaged me "lol where are you?". I didn't respond until about 3+ hours later, to which I said "Just an event". Have had no response, back to silence. He f's up my brain...
Why is he doing this to my brain?
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