Why do you see gravity as weak?
Gravity is always there, constantly. A star is like a bike rider trying to go up a tall hill. As long as it has energy (fuel) to keep the engines burning, it exerts an outward pressure against gravity, pushing its stuff outwards from its core like the rider going uphill. As it burns out, that pressure drops off - it can no longer go "uphill" against gravity - and the star starts to compress or implode, like the bike rider losing his energy and rolling down the hill backwards.
Slightly naive example, but I don't see gravity as a weak force overcoming the strong force of a burning a star just like I don't see a tall hill as a weak force beating a bike rider.
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