Is it unsafe to reuse the same username and password for multiple accounts?

[lisa]

I did the same thing and yeah, I did wind up having a problem. My username and password wound up getting compromised...from a boyfriend who has a computer that saves passwords. Then when he was mad at me he had access to EVERYTHING. After that, I use a few different ones, but I have two or three that I use and two or three passwords that I use, so if one doesn't work when I go to log in I know it has to be one or two of the other ones. Since you don't want obvious ones, I use things like...my ATM password....my birthdate year and my zipcode together...perhaps an old locker combination password...maybe an old cell phone number. I always try to have the passwords have some significance so I will remember them.