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So I took the battery to my local auto parts store. They said the battery was dead, but it was otherwise good. The guy explained that if a battery is really dead, jump starting only works when you let the car with the good battery run for "a while" to charge up the dead battery. I did not do this yesterday. Anyways, he said he could charge it for free (I don't have a charger) in about an hour. I returned for the battery about 3 hours later and he said it was around "85%" and that if the truck still didn't start, it wasn't because of the battery. He also said the battery was only about 1 year old.
So I bring the battery back home and install it. Still doesn't work and I have the same problem as the other day. Except the buzzing sound isn't there (the auto parts guy said it was the starter relay and it makes that sound when the battery isn't producing enough juice). I decide to try jump starting it again, and it still doesn't work. I wait about 5 minutes while the car with the good battery runs then I try again and after a few tries, it works!
While driving it around, I noticed a few things:
1. The ABS light comes on randomly.
2. The red battery light comes on in the dash very faintly sometimes and flickers rapidly, especially when I give it a lot of gas.
I don't know if these 2 issues relate to the starting issue, but I'll find out over time.
With respect to issue #2, I'm wondering if there's a problem with the alternator? I think I could stop by the auto parts store again and find out. I have a voltmeter, but I'm still in the process of unpacking my tools (moved a few months ago) and it would take a while to find it.
Thanks again for all the help you all provided.