HELP

A married lady who I had a brief fling with last year has just sent me an email to tell me that she found out on Christmas Eve that her husband has been seeing someone else for the last year.
I really liked her but I did'nt want to spilt up her family so I called it off. Now she is single again I'm not sure what to do. I think I better keep clear for the time being in case she takes him back but any advice would be of help...................anyone