trying to move on

Hello everyone,
Just when I thought it was going to get easier, It gets worst. I find out that my soon to be ex is dating someone I work with and it is really taking a toll on me. I am very depressed and can't focus. I am falling behind in school more than I really should or was.
I knew we were not getting alone, but right now is not the right timing because I want to finish school, but this is making it really hard for me.
I am up for ANY ideas to try to focus on my school work to at least pass class. I work two jobs and have three kids to take care of also, and that is a lot for me too.
Sorry for babbling on, just very hurt and need some help.

Tammy