Old EX texting me now i've split with girlfriend? but..

I have just split with my girlfriend of 2 years. And i saw my older ex of 3 years ago about a week later and she was quite flirty and smiley, i gave her a hug and showed attention back.
I've always liked my older EX she's been on my mind from one of the first days i've met her tbh, but we had a short old relationship and it didn't really work.

Anyway, she's now texting me.. But earlier she didn't seem so flirty and texts were short and blunt, and haven't had a text for about 5 hours now. I don't get what she's at? I mean, if she liked me, would be massive for me, this girls always been the 1 as far as my mind is concerned deep down.