Heartbroken and Confused

I am thoroughly confused. I joind the Divorce and break up "support group" because my fiance left me 4 months ago. So I told my story of how we met while he was still married to his ex but we didn't even start TALKING until after he was divorced to give some insight to our relationship before I cried about my broken heart due to him getting cold feet and leaving. I Recieved two replies, both stating that I was in the wrong for dating a married man. Now I feel unwelcome and reluctant to add any more posts for fear of unfair persecution. Yet another member is getting tons of support after admitting that she is having an affair! I just don't get it. What is the mentality behind this?
 
I am a new resident to Arizona and have only one friend here and my family is estranged. So where am I to turn to for support while I am grieving??