What does "Ich bin Dir verfallen. Ich weiss nicht weiso, aber ich habe welche." mean in German?

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Das würde ich als "I have fallen for you. I don't know how, but I have" verstehen.

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"Ich bin dir verfallen" means "I have fallen for you". It's much more than just to like or love somebody.
In the second sentence, "welche" refers to something in a previous sentence (I have some of them). It's hard to guess what is meant without knowing the context.

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The term "Ich bin dir verfallen" means, to really like someone. You can't think of a different person.
You are kind of addicted to him. The rest is like "I don't know why, but I have some."
Probably, the person talks about "feelings".

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Hi,moin moin,nin hao,hello.anyong haseiyo Rachel :-)

Ich bin Dir verfallen. i got addicted to you
 Ich weiss nicht wieso,  I dont know why
aber ich habe welche BUT I HAVE SOME ... this last part doesnt make any sense,please recheck !