Im having a hard time trying to decide weather i should contect my ex's mother who i have just found on facebook.

Heres abit about my situation-
My ex has denyed my son since day one even after being in a long term relationship, his mother belived him and respected his wishes not to talk to me during my pregnancy, we seen each other weekly at a dog club but she just ignored me, after bubs was born she spoke to me for awhile but then stopped as i went though a messy time with her son dragging him though courts for a DNA test and child support, mths later it did come back that yes, her son is my sons daddy. I havent seen her since the DNA results as i left the dog club due to feeling so sad that she would ingore a innocent baby. Now im thinking should i make contect again to try and get some sort of relationship going? for my sons sake or just let things go?

wat would i even say to her?