After 3 dates and planning a 4th, guy says he's "not seeing a future" via text. How should I respond?

I (27F) matched with this guy (30M) about 5 weeks ago on Hinge and we have a ton in common and get along really well. We went on 3 dates and at the end of our last date last week, I told him I had a good time and he responded that he did too, and that next week (this current week) we should go hiking somewhere. He said he'd give some options for where we could go. When we were texting yesterday I asked what the rest of his week is looking like, and he asked if we could go over the weekend since work is busy for him this week. I responded this morning at 9am saying the weekend works for me, yada yada. Then he didn't say anything until 5:30pm and said this, out of the blue.

“Hey I really don’t want to play games at all with you. It’s been fun hanging out, I’m just not seeing a future here and I hate when I think I’m wasting someone’s time. I had a good time getting to know you”

I have to respect that, but I'm so confused. Why even mention a 4th date last week? Why suggest the weekend to me yesterday? Like I'm legitimately so upset. I really enjoyed our time together every time we've hung out and he's the first guy I've had real feelings for since my last long-term relationship ended just over a year ago.

Should I ask him why he feels that way? Or just how should I respond?

It's worth noting we haven't kissed yet, though I didn't find that unusual since I didn't kiss my ex until the 4th date (he didn't want to seem creepy by doing it too soon and wanted it to be the right time). So I know it's better he said this before things went too far, but still. This just wasn't the text I was expecting to get.
After 3 dates and planning a 4th, guy says he's "not seeing a future" via text. How should I respond?
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