Other
snob - A person with an exaggerated respect for high social position or wealth who seeks to associate with social superiors and dislikes people or activities regarded as lower-class
Victor used to be friends with Pete, but once Victor suddenly became rich, he acted like a snob and refused to associate with Pete.
wedge - A piece of material with a thick end that tapers to a thin edge, used to split, support, or secure things; also something that forces separation or division between people or groups.
The disagreement drove a wedge between the two longtime friends, and they really didn't enjoy spending time together anymore.