Air signs and their detachment?

Ive been dating this Libra guy (not rlly bf-gf status yet), and he was very aggressive in his pursuit of me. Always calling and asking when he could take me out, it was a good month before I said yes to a date. The beginning of this month he let me know that it was gonna be somewhat crazy for him at work, so its not like hes been distant out of nowhere. I saw him last Friday, he drove 30 mins on the freeway just to hang out with me for an hour. And still he said for the rest of month he was gonna be super busy. I think only seeing him for that short hour made me miss him even more. I called him 2 days ago, he texted back saying he was working and that he wud call me ltr, but he nvr did. So I decided that I wud let him call me when he was able to. I havent heard from him. Maybe its cuz I'm a Leo so naturally I need alot of attention and reurance, and I have no air in my chart so I don't rlly get it. I wud think he wud at least text me something short, or take a min just to say hi. But I guess that just shows how busy hes been. I know air signs are very detached and arent rlly attention freaks like fire signs, my moms an Aquarius so she can be detached emotionally sometimes. Is this normal for Libras too? Am I right to be letting him contact me when hes ready?