Feeling used!!!!? Made out with guy whos been afta me 4 weeks, but 2dy he's acting like it was no big deal!?

I went on a date with this guy, and we spent most of the eve makin out!! Now I feel weird, like he got what he wanted so now he's stopped bothering to be nice! As in i was expecting at least a tex or email (we work in same organisations-diff departments) from him saying somethin about last nite. But I emailed him first asking if he was ok and he replied 'am great how are you?' Am i reading too much into this or what!??