Mysql stopped

I was logged in last night doing some looking around and logged out. Just got home and brought up the log in screen entered my info and when I hit the login button it came up with a MySQL errors. I looked at netstat and it looked like this:

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:81 0.0.0.0:* LISTEN 25061/ispconfig_htt
tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 12419/proftpd: (acc
tcp 0 0 192.168.1.101:53 0.0.0.0:* LISTEN 25248/named
tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN 25248/named
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 13884/master
tcp 0 0 127.0.0.1:953 0.0.0.0:* LISTEN 25248/named
tcp 0 0 :::80 :::* LISTEN 25100/httpd
tcp 0 0 :::22 :::* LISTEN 2036/sshd
tcp 0 0 ::1:953 :::* LISTEN 25248/named
udp 0 0 0.0.0.0:1024 0.0.0.0:* 25248/named
udp 0 0 192.168.1.101:53 0.0.0.0:* 25248/named
udp 0 0 127.0.0.1:53 0.0.0.0:* 25248/named
udp 0 0 :::1025 :::* 25248/named

So I ran "service mysql start" and it started.

Why did it shut off when I did not do it????

 

Please have a look at /var/log/syslog or /var/log/messages.