Needing some insight?

I've been knowing this guy for well over fifteen yrs. We're both in our mid to late twenties now. We grew up near one another and he is my older brother's best friend. We would joke around in high school and in recent years he has been flirting. I've told him numerous times that we wouldn't get pass flirting because he was my brother's friend. He obtained my number from my brother cause he tile him he wanted to ask me something. So he began texting and calling me. I didn't mind the flirting but I reminded him it wouldn't be anymore than that. Then one night we were both drinking and we basically we did things we should not have. The next day he called and texted saying that he felt guilty. He hasnt called or sent a tested. MY ACTUAL QUESTION: Was I basically used and thrown away after he got what he wanted OR is he not talking to me because he feels actual guilt?