Why are there 2 bulges when there is a high tide

Answer: Because of inertia

The tides are produced by a gravitational imbalance that decompensates the oceans throughout the Earth. They are ups and downs of sea level that occur several times a day and change with the lunar phases, but not because of the shape that the Moon looks like.

However, it should be noted that the Sun also exerts a gravitational force in the oceans, but to a lesser extent, because it is further away than the Moon.

The Moon attracts the water that is closest to it; thus, the part of the ocean that is facing the Moon bulges towards it, and on the opposite side too, the water bulges in the opposite direction.

This is due to inertia, because the Moon attracts the whole Earth, in addition to water. What happens is that the earth is rigid and does not bulge. Inertia resists gravity and pulls in the opposite direction. That is why the ocean on the other side of the Earth also bulges, although less.