Why British betrayed Haider?
"In 1770, when the Maratha armies of Madhavrao Peshwa invaded Mysore (three wars were fought between 1764 and 1772 by Madhavrao against Haider, in which Haider lost), Haider expected British support as per the 1769 treaty but they betrayed him by staying out of the conflict. In 1780, he befriended the French and made peace with the Marathas and the Nizam. However, Haider Ali was betrayed by the Marathas and the Nizam, who made treaties with the British as well"
...as title say, why British betrayed Haider?