How to text him “I miss you.” without sounding too clingy/needy?

I’ve been talking to this guy for almost a month. We always have a good time every time we spend time with each other. Ongoing conversations, lunch & dinner dates. I really vibe with him because of his humor and his religion. He sees God differently, and he’s a preacher. With that being said... he flew to L. A 10 days ago to meet his brothers. So I’m counting 7 more days before he comes back here in Hawaii.. he texted me before he left said his goodbyes, told me that he won’t be too long. We never had a conversation after that because I know that he got a lot of things to do.. but I really miss him... and I don’t want to text him that I miss him knowing that we’re still in the phase of talking. How do I tell him that In other words? How do I express myself without making myself look clingy and needy.
How to text him “I miss you.” without sounding too clingy/needy?
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