In the United Kingdom the song debuted at number eighty-six on the
UK singles chart, climbing to number six the following week, becoming Fender's fourth top-ten song and Dean's second consecutive top-ten song after "
Nice to Each Other". On 26 February 2026, the song peaked at number one at its thirty-fifth week on the chart, breaking the record for the most consecutive weeks in the top-40 before reaching number one, previously held by
Ed Sheeran's "
Thinking Out Loud" with nineteen weeks. It also became Fender's first and Dean's second number-one song on the chart. The song topped the chart for nine non-consecutive weeks. In Australia, the song reached the top ten on the
ARIA Singles Chart on week ending on 19 February 2026. It become Fender's first top-ten song on the chart and gave Dean three songs in the top ten simultaneously, with "
Man I Need" at number one and "
So Easy (To Fall in Love)" at number two. On week ending 19 March 2026, "Rein Me In" peaked at number two, behind Dean's "Man I Need". In the chart week ending 3 April 2026, the song reached the top of the charts, replacing "Man I Need", which dropped to second place, becoming Dean's second number-one hit and Fender's first on the Australian chart. ==Music video==