I have recently started having this problem:

I meet an interesting girl(social circle), chat her up and take her number. Sometimes I am even offered the number. Pretty solid game till here, make sure I kino, keep the conversation light and fun with a connection thrown in. Ask for the number, get it and tell them lets hang out sometime, this usually meets with a very positive response.

I am limiting this to girls I met in my/friends social circle, outside of this I haven't experienced this problem.

So, recently I got 2 #-closes. Texted 1 and things were flirty and fun. Promise of drinks on the weekend. Sent a text on day of saying: its...blah blah..place should be awesome. No reply till an hour before the time we are supposed to go, and then something to the effect got stuck at work, dont think I can make it, will try.

Just replied with a Ok. No contact since(3-4 days).

The other one, I met her at a friends place. We spoke for a bit, got to know she likes the same stuff as me. Kino, connected, #close.

She sent me a text with her number, I went for lets hang out(I can't/don't text too much) she kept saying sure but have this to do and something or the other always. Seemed genuine enough reasons. But with a I will try, if its possible. Hasn't been possible yet.

The comfort level is the only thing I can think of which might not be working here, but then again I don't think I can build more on just text and making a plan with these loose circle of friends just to meet someone I already number closed would be a bit of overkill. Plus I don't know the social circle well enough to initiate a plan.

Now I don't know what I am doing wrong here, but there seems to be a block of the puzzle missing. Can someone help me identify what I might be doing wrong here?