How do I tell an INTJ guy over text that I really like him? And that I want to know if there’s a chance to properly date him?

Problem here: the INTJ is in a open relationship and he made some hints that he is not really down for only physical stuff. He needs first somewhat of a connection. And he moreover said that he uses the open relationship to see if his girlfriend is still fitting in his life. For me - an ENFJ - a rather weird notion.

However, we did kiss once and I do really like him. We text almost daily and our conversation get really weird in a good way. Now I would have a great opportunity to answer his text with a hint that I like him.
He asked me after a funny conversation how we should define our relationship in my opinion. Now what do I answer?

I want to get to know him better. And I would like to know how stable his relationship really is or do I even have a chance to date him properly
How do I tell an INTJ guy over text that I really like him? And that I want to know if there’s a chance to properly date him?
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