What would you do in this situation?

On sunday i hooked up with a guy I have know for 2 years, give or take, yet we hadn't seen each other in 8 month.

I figured we would just have some fun since I didn't know when I would see him next for sure. We didn't have sex & yeah I felt really s**** afterwards.

He asked for my number & I ended up giving it to him.

Monday we talked & everything was fine, just chatting.

Tuesday he told me how much he missed me & wanted me all that sweet talk which I would just say ok to, not thinking he might actually mean anything.

Wednesday I was busy all afternoon so I couldn't talk as much.

Thats when I started thinking & wanted to end this 'thing', though I have no idea how to tell him or what to do.. I haven't answered his phone calls or text messages since then.

btw, he has called 28 times throughout yesterday & today which got me on posting this.

Oh & he only speaks spanish & I am not as fluent as I used to be.

If he calls later should I answer and tell him something?

Any suggestions on what I could say?