How can I ask a guy if he is serious about me?

I have been seeing a guy for a month. We see each other every few days and I really like him. He also often tells me how much he likes me, holds my hand in public etc. But he hasn‘t asked me to be his girlfriend. Do you think he only wants this to be a situationship? Can I bring this up and if yes, how?

How can I ask a guy if he is serious about me?
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