There are two tidal bulges on the moon for the same reason there are two tidal bulges on the earth, near and far sides of each body are pulled differently. So the moon is pulled slightly away from a spherical shape into a football shape, with its long axis pointing toward the earth. But the earth’s tides, the tidal bulges are stationary, with no “daily” rising and falling of moon tides. Since the moon takes 27.3 days to make a single revolution about its own axis, the same part of its surface faces the earth all the time. This is because the elongated moon’s center of gravity is slightly displaced from its center of mass, so whenever the moon’s long axis is not lined up toward earth, the earth exerts a small torque on the moon. This tends to twist the moon toward aligning with the earth’s gravitational field, like the torque aligns a compass needle with a magnetic field. So we see there is a reason why the moon always shows us its same face!