Why hasn’t my boyfriend washed my thong that u left at his place?

i usually go over to my boyfriend house I tend to always take an extra thong because the one I’m wearing gets so wet ahahah. That day I didn’t have an extra one and I left it at his place , I told him to keep it and wash it. Well weeks past and i told him if he has washed my thong and he said no. I haven’t told him to give it back to me but why hasn’t he wash my thong?
sorry if this is a weird question lol 😆
Why hasn’t my boyfriend washed my thong that u left at his place?
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