Should I try or call it quits?

The past three weeks I've been texting this guy that I work with and he would text me daily and during work. He told me I was cute and he liked me the whole 9 yards. I thought things were good between us. However, as of 4 days ago, radio silence. He has not texted me, or tried to really make a plan with me. I don't know if he lost interest cause I didn't give him sex. He talked to me today at work and he initiated the conversation but I'm feeling kind of sad that the fling might be over? Do I say something or do I just walk away?

Should I try or call it quits?
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