Will we start dating or is it just friendly?

Flirting back and forth and getting to know a guy in my office for 2 months now. We text regularly and speak at the office. I have hinted at meeting up outside of work a few times and he has welcomed the idea saying it would be great.
He asked me to lunch and so during our office lunch time he drove us to eat out and paid for both of us, we sat down at talked for an hour or so.
How do I know if he is just being friendly or it is something more and he is interested in dating me?
Will we start dating or is it just friendly?
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