DISCLAIMER: I know we all can agree to disagree and what works for one may not work for another. I am just sharing another perspective and this isn't a slight to the OP or other perspectives...
...ok...and, ladies, if someone "hear" me, then holla...cause, maybe it's just my own warped sense of reality but...chasing after closure and answers to "what-if" in romantic relationships is really sticky...sometimes you gotta read the signs because in romance, people CHOOSE not to say things that they know will hurt another....they don't tell the tough truths. Also, if someone is feeling you out on their own schedule....trying to mull over how they feel but you are calling talking about, "why didn't you answer?" or "I just wanna know what's up?" then you could quite possibly run them off before anything could blossom. Men and women are the same in that regard...any man calling me wanting to know why I haven't reached out yet would have been terminated from prospect immediately...some folks do not like to be questioned about the manner they choose to express themselves in...it's unattractive and off-putting. Some expectations are understandable, but some, can be alienating. If you aren't feeling how he is responding over time, then give him less time...at that point, he'll either step up his game or disappear and you will know exactly what you need to know....that he adores you or that he's moving on. Truth be told, that's all we need to know...we don't need to know "WHY" someone doesn't like us cause that someone might be a crazy, delusional fool whose assessment of you is sorely lacking.