My Truck Killed 3 Times On Way Home

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truck wouldnt start at school, got a jump and it ran fine. (i have changed starter soeniod, batery and alternator in last 2 weeks) sio i fugure battery is screwed. on the way home it killed at a red light, had t push it off roadup hill in to lot, not fun. i run an elec fuel pump so can teh battery be so dead that it wont get any power to teh pump? i pray that thats why it killed. called a friend and he jumped me, ran good for 5 miles, the killed when i slowed down to turn, when i turned the key nothing at all would happen. jumped it(friend followed me home) and it ran till i got a mile from house. it started to bog down real bad when i gave it gas, so isaid screw it and gave it gas, it killed. puteh cables on it and floored it and it did fine, pulled up in driveway and it killed. that was 5 minutes ago, takin the batt to walmart since i go tt frm tehre and gettin it checked, hopefully its jsut that, i get scared hen the motor kills, dont wan tto rebuild it, any thoughts? thnks