Why did wingina stop giving food to the colonist

Wingina was the the principal chief the Secotan indians during Sir Walter Raleigh's two expeditions to America in 1585 and 1586  

Wingina had friendly relationship with the expeditioners but relations turned sour when the English both exploited and subjugated the Indians taking advantage of their superior weaponry and the natives' superstitions.

Pemisapan (as Wingina was later known as) and his men planned several schemes to throw off the English yoke of oppression, but efforts were in vain and culminated in tribe being wiped out and the decapitation of Wingina himself.

i believe it is capitalists.