My 2005 dodge neon sxt has been running hot for a few days.. 2 months ago i got it repaired for this same problem.. what can be the cause of it to continute to run hot?

Here are the least expensive items in order of least to greater...Check for proper coolant level in small tank next to the radiator. If low... refill to proper level. make sur eyou use the right stuff for you particular engine . Any good auto parts place can help with the "right stuff"
if OK, next...
Replace the radiator cap. if still getting hot, replace the temp sensing valve ( thermostat) at the engine side of the top radiator hose. If it looks grungy, you may still need to get the whole system flushed.

This is a very messy job that removes the foul stuff in the cooling system which may prevent coolant circulation.
If the water pump is defective and it was changed 2 months ago take it back to the place that installed it.
Check for loose belt driving the water pump first