What shall I do?

So I recently started a new job about three months ago… about two months in and this guy that works with me starts flirting with me by teasing me and bumping into me etc. I play along because it’s banter. He’s turning 30 this year whereas I’m only turning 23. Anyways, then he requests me on insta and we start talking. We go on our first date a week in and from then on for a month we go for dates once a week. We keep contact minimal while at work because we don’t want our other coworkers to know that we are seeing eachother. Then about a month in, when work becomes a bit stressful for him he decides to distance slightly and when I bring it up he tells me he’s been single for 6 years and find it’s ‘intense’ talking to someone now and that he wants to take things slow. Then, two days later he decides he’s not ready for a relationship. I don’t understand? I’ve obviously distanced myself, removed him from my socials and avoid him at work but I just do not understand how a man who’s nearly in his 30s still is not ready to settle.

What shall I do?
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