Why do girls unmatch me on tinder?

I purchased Tinder plus and I use tinder in different countries I travel to Finland , sweeden etc.. I match with a lot of foreigner girls but some of them unmatch me I dont know why I think maybe they unmatch me because I'm a foreigner to them or they unmatch me because I don't message first Why do they unmatch me what do you think?
They unmatch you because you're a foreigner to them
They unmatch you because you don't message first
Other
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Why do girls unmatch me on tinder?
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