Have i been blocked online?

May be...

when i try to send a message to someone on my friends list. it says sending failed error 8002aBOB. i dunno if he's blocked me. my whole connection on ps3 has been pretty **** anyway lately.

You haven't been blocked. 8002 errors is caused by your network. I assume you have two or more routers/modems. I port forwarded the ports needed to play online because my firewall blocked its connection.