Cocaine test strip??? Help. ******UPDATE******

Hi so Iv been suspicious of my partner since new year. I found the wee orange bag of white powder 2 weekends ago and just remembered I still had it. I put some in water and used one of these cocaine test strips which has shown a positive for cocaine. My question is this reliable since it is a urine test strip? I’m going to confront him tomorrow when he gets in from work. I pit some of the powder on my tongue and lips and they went numb

*********UPDATE**********

So I gave this wee bag to my dad and he confirmed through a couple of friends that this is coke. My partner has lost the plot and is furious with me which I understand since my dad decided to go and speak to him when for the past 3 months this situation has been contained between only the 2 of us. He still has no explanation for where the mysterious white stuff came from in the bathroom, living room floor around where he sits at night, and a hotel floor we stayed at along with the hotel bathroom. Now he has left me, hates me etc

My question? Could I be wrong? I am doubting myself or is that what he wants? He wanted me to promise not to accuse him of sneaking around, not to look in his things(when Iv already found 4 other wee plastic bags that had white stuff it them)

If I couldn’t promise to basically forget the whole thing then he told me it was over.