Why would a guy call, sound interested, then go silent again?

So we've been talking texting for 3 months. Getting to know each other. he's talkinnabout a relationship if I want one. Im slow to get involved. We quit talkin for 10 days. I gave in and text him. I said good morning. I was thinking of you. Hope your doing good. He read it and called me after he read it. He sounded happy and thanked me visited briefly he asked what I was doing on Saturday this coming week. Its his day off. He said he's been thinking of me too and telling me how he's doing.. asking how i am. He was at work and said he'd call me back. That was yesterday morning and I haven't heard from him since. He said he works today and I told him im working. This is all obviously deliberate I dont know what its supposed to accomplish?

Why would a guy call, sound interested, then go silent again?
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