Gravity is the weakest of the four forces in our universe. The bending of spacetime occurs when an object sits on the cosmic landscape we know as space. The denser the object, the more spacetime bends and the stronger the gravitational field is. Its like putting a bowling ball on a mattress and the dent the bowling ball makes, pulls anything else in its event horizon, for example, a marble near the bowling ball on the mattress. Unlike popular belief, gravity is not responsible for objects hitting our earths surface, everything headed toward earth is in free fall, just like the earth itself.
So what holds things against the mattress? The eye assumes gravity does that, but gravity is what you were trying to explain. So that is not only a circular definition, but it also introduces a flood of new unknown forces to account for.
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