I think i need to worry about the alternator, not the starter. Because, after jump-starting the car with the clutch, and driving it for ~15 mins to the local park then hangin out there for about an hour, I went back to the car and it started up normally. After that, its been normal for the rest of the evening.

I dont get it!! But, my guess is that the alternator isnt charging the battery enough to give it enough power for the next startup...