Need Help Please!!!

I am having trouble with my lesabre...It started about am onth ago when iwent to visit my children in Jamestown Ny. The car was fine and when i went to start it,it would not start...I had to jump it almost every tie i had to go somewhere. Now that i am home it was fine...I went to the store New Years Eve in the morning and it was fine,Then New Years Eve Night i went to go to the inlaws and the car would not start not even with a jump or a booster...I was told many things but i think it is the starter...I waas told the fuel pump but i can hear it when i try to turn over the car so i know it is not that...What ever it is it keeps draining the battery...It is not the alternator i had that tested it is fine...I need a opinion on what it might be.Thanks

Welcome to AF. I assume not start means it won't crank, if so have all the battery cables and grounds cleaned and checked then have the battery load tested , check the alternator output under load also when you get it running. If the battery goes dead overnight, or after sitting for a few hours and it did check good after a charge, then look for a drain. BTW, post the year of the car.