Guy gave me a ring, what finger do I wear it on?

I've been dating this guy for about a month. we see each once to twice a week. so it's serious, but not that serious. and we are exclusively seeing only each other.

Recently he went away on a trip and when he came back, he gave me a ring. Nothing fancy, just a cute little ring.

I might be over analyzing this, but what finger do I wear it on?
Guy gave me a ring, what finger do I wear it on?
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