He asked me out for coffee. How to know if he’s really interested or I’m just a option for him?

We have exchanged numbers. Due to some reason we can’t meet right way but we have plans to meet. So far we’ve been texting each other.
He seems interested. He playfully teases me a lot etc, says often goodnight at the end of our conversations and wishes me a good working day.
He asked me out for coffee. How to know if he’s really interested or I’m just a option for him?
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