Catching feelings never stumble,
“Catching feelings” means to fall for someone, often unexpectedly. This never happens to Ricky, because if you “never stumble” you won’t ever fall.
“Catching feelings” is a direct reference to the angel of death he’s making love to in the previous line. Meaning, he’s started loving living dangerously, but despite that he doesn’t stumble—he walks that dangerous line without falling off.
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