Is there an expression to describe a situation where someone could have helped you but they didn't?

I would like to know if there is an expression that describes a situation where someone, perhaps your friend, was capable of helping you but they didn't or they chose not to?

Eg: He was was free. He could have come over and consoled me. But he __________________ [didn't help despite the fact that he could].

An expression or a proverb applicable in this situation will do.

But he 'passed by on the other side'.

This idiom refers to the parable of the Good Samaritan, where certain chose to leave the wounded victim lying on the road, passing by on the other side.

To ignore or avoid someone who is in need of assistance. We as a people cannot continue to pass by on the other side as thousands of our fellow citizens are left on the streets in poverty.

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