Friend said he was interested in me, then started dating someone right after?

He's one of my closest friends, we've been friends for several years now. 2 months ago, we were drinking and I told him I love him a lot. He replied "I've had a crush on you for a long time" which shocked me and I froze. I didn't expect him to say that and I had no idea. Then, one month later, he started dating someone else. Is this my fault because I waited for him to tell me again when we were sober or do you think he was faking interest in me and it wasn't really real?

Friend said he was interested in me, then started dating someone right after?
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