Steadfast

"Then they cried to the LORD in their trouble, and he delivered them from their distress."

The chapter basically goes like this...

Israel screwed up
They cried to the Lord
He delivered them
(repeat ad nauseam)

Here's how the chapter concludes

"Whoever is wise, let him attend to these things; let them consider the steadfast love of the LORD."

Notice this. God's love is... STEADFAST

Synonyms for steadfast are as follows:

dedicated, faithful, inflexible, intense, relentless, resolute, rigid, single-minded, stubborn, unflinching, unswerving, unyielding

His love is... STEADFAST