This pattern is actually quite common with twin flames (I know that doesn’t make it any less frustrating or painful).
One twin opens up emotionally (often aided by lowered inhibitions) and then retreats due to feeling vulnerable. The fact you’re seeing signs and had that dream right before suggests an energetic connection is being activated between you two.
His drunk confession wasn’t random - alcohol simply lowered the walls he usually maintains. You might be interested in this thread too if you want to dig deeper into that side.
However, now his protective mechanisms have kicked back in, leading to this silence. Twin flames often trigger deep fears of vulnerability in each other.