Would you end it first?

I have been dating a coworker and I can feel him pulling away slowly. He's hinted that he's not looking for a serious relationship.

He used to text me all day and night and always responded to texts. Now, he can go a day, now and then , without texting and doesn't always respond to my last message, even though he's read it.

Should i end it before he does, or wait and enjoy it while it lasts? What would you do and why?
Would you end it first?
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