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Typically the main bearing goes bad and causes the fluid to leak out. Antifreeze has a lubricant in it which helps to lubricate this bearing. If only water is used in the radiator, this would shorten the life of the bearing. Otherwise, just normal usage would cause it to fail at some time. Premature failure can also be caused by having the drive belt too tight on it. A serpentine belt with automatic tension helps to prevent this problem.

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Yes. A pump does not have to leak to break down

pump drinking water from a well

Assuming you have the 2.5 engine, the water pump is driven off the timing belt.

50 metes

Coolant is sucked in from the lower radiator hose, pumped into both sides of the block, through the block, up into both heads, through the heads, out the front of both heads into the intake manifold, out through the thermostat housing, into the upper radiator hose and back into the radiator. All coolant connections on the exterior of the water pump are return/suction.

Yes, the internal parts of the pump can rust, and effect water circulation.

There are several manuals on the market that deal with such matters. They include diagrams and step by step instructions.
Such procedures are difficult to explain to someone with no mechanical knowledge.
If you need to ask such a question then it would be advisable to take the vehicle to a competent mechanic.