I have been seeing this guy since April , how do I approach getting him to define what we are?

We met on Tinder, and I know everyone says to avoid it for long-term relationships, but he is really sweet. He makes me laugh and feel good about myself. He has met my mum, sister, and brother because they are in close interaction with me regularly. People have called him my boyfriend, and he hasn't corrected them.

We message, call, and see each other regularly throughout the week, and he has made plans for future dates and things he wants to do in the near future. However, I don't know how to approach the discussion of "Hey, what are we?" I really like this guy...

I have been seeing this guy since April , how do I approach getting him to define what we are?
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