Mixed messages

So, my ex contacted me a few days ago, asking what I was doing for my birthday.  I told him I hadn't thought about it, and he asked if he could take me to dinner.  I was hesitant but thought maybe finally he would shed some light on what happened and how things stand now.  I agreed, and was actually really looking forward to it.
Went out and bought myself a nice new outfit, was gonna look my best and show him what he was missing.
Got a text today saying his work has changed his schedule so now he has to work - can I reschedule? I am now left wondering if he has decided against the whole thing, I can't really see him getting in contact to reschedule. I just feel like one day he wants me, the next he doesn't.  I know what everyone will say, cut all contact with him.  But it's him that texts me, I'm never the first.  And to be honest, my heart is still holding on for hope.So, I'm left wondering should I cut all contact, ask him outright how he feels, or play it all aloof in the hope that he'll think I have moved on? I have been opting for the latter to protect what's left of my pride, instead of feeling exposed and humiliated.