I do both of those, and my pass was ike 13 characters long. I think he keeps using a brute force
Or have to executed any kind of exe file sent by one of your friends? Its possible your computer is infected by some kind of keylogger. Better download an Anti-Keylogger and find it out.
it says theres nothing on my pc
Who? Your anti-virus? Well I hardly trust those things. Download an Anti-Keylogger.
i did
Well the two well known possibilities for hacking accounts is keylogging and phising, especially when gmail is concerned.
Do you share your password with anyone? Siblings, parents? They could also have made such mistakes.