I have been talking to this boy for over a month?

I have been talking to this boy for over a month a I really liked him. And we spoke on the phone and we texted each other, but tonight he started excusing me of lying and started being rude and mean, how can I block someone's number of my phone so they won't text or ring me anymore?
I have a IPhone 4

Maybe he was in a bad mood. Give him another chance

U girls give us a break to, we also get in bad moods sometimes, u girls are crazy changing moods all the time.