He won't return any of my texts or calls and he's not at home?

[Hannah]

So my boyfriend of 3 months and I got into an argument last night because he forgot to pick me up after practice ( because my car is in the shop ) and he acted like I never told him to pick me up. I even texted him 30 minutes before so he would be there. Anyway, I yelled at him and told him that " he was stupid and how could he forget about his own girlfriend and that he wasted my time ". I feel bad now, he's the kind of guy that gets angry/sad rarely and when he does he doesn't show it ( I can see deep down inside )... I tried texting him this morning to say I was sorry for last night and I hope he will forgive me. I also called him like 8 times trying to get ahold of him. I even called his house and his brother told me that he left this morning. I tried calling/texting him and so has his family. He's never acted like this before, maby this isnt even about this?