Pick your own reason.
If you absolutely have to have a reason in order to save your sanity, go ahead and give it a reason – either he wasn't ready, wasn't interested, he was still involved with someone else, he met someone else, he's addicted to work (or something worse) in his life, he's too young, too old – whatever, you get the point. Pick whichever reason makes you feel better. And then, as hard as it may be to actually do this, let him go. Find your peace in accepting what is.
If he lost your number, he'll find a way to contact you some other way. Men in hot pursuit of something they want to pursue know no roadblocks. Let it go. He's not the one for you, obviously, regardless of how much potential he seemed to show. The reality is that you didn't even really know him well enough to make that assumption. No matter how much chemistry, no matter how attractive he was, no matter how much he pursued you. In the end, none of this will matter.
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The only thing that matters is that you have saved yourself that energy, that time to focus on yourself and being available in every way for that guy who is looking for you and is ready to pursue you in such a way that there will be no question that he is truly ready and available and interested in you and everything you have to offer!
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Jane Garapick knows firsthand what it's like to have a broken heart, a broken dream and a broken you. She writes about adventures on the rocky road to finding Mr. Right at www.gettingtotruelove.com. To get started on your own personal journey to true love, download Jane's complimentary guide "Find Your True Love: 10 Simple Steps to Getting the Love You Want...and Deserve"