missing condom?

My boyfriend and I bought a 3 pack of condoms and kept them in my car, my period started and we didn't have sex for a week, and then other stuff came up and it turned into two weeks. Well when we finally were gonna have sex I grabbed the box and one was missing. he claimed he used one to masturbate in because of "the mess" But he masturbates in the shower for that. I just don't know what to do or say :( 

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