Why did he flirt with me all the time and then when drunk told me we'll never be close?

I've known him for a handful of years. We initially hit it off really well and would always laugh and joke around. Then one day he got awkward and said maybe we'd go out sometime. It only got weirder after that. He'd frequently make comments about taking me out sometime and us going out for drinks, sometimes even calling it a date. We'd never actually make plans, though. He'd hold my hand, tell me he thinks I look cute, mess with my clothes, tease me, pick me up in hugs, lend me his coat, etc. I even asked him if he really means all the things he'd said and he said yes. Finally about a year ago he asked me to go get drinks and we actually did. He was super drunk and ended up telling me he thought I looked cute. Then he also told me we're not close and never will be. I asked him the next day what he meant by that and he said he doesn't mean to come across that way. Then a few months later I asked him to put for drinks and he said yes and acted super excited. We never ended up going because he got distant and just pushed me away. We haven't talked in over 6 months and I'm just confused. He's an alcoholic which doesn't help. Why did he act nice and then push me away? Why did he frequently flirt and act nice and then say we wouldn't be close? Is it because of the alcoholism? I just never understood what happened. And I still catch him staring at me. I feel like he just hated me all of a sudden and I don't get it.

Why did he flirt with me all the time and then when drunk told me we'll never be close?
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