I have a problem with my radiator and antifreeze, What could be the problem?

Hi guys I have a Honda civic lx 97, I bought about 7 months ago, since then I have bought a new radiator because the old one had a huge leaking problem, anyways I never new How long a gallon of antifreeze could last me. I now know I use too much (I ve bought two gallons once the first time i changed the radiator, again today[spand time of 4 months]) antifreeze I don t see any leakage, what could the problem be?

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