Not sure what to do. . .can anyone help?

[mbe76]

So things have totally changed again- On Wednesday I was planning to meet a male freind to discuss the sitch- and I was due to meet him- and as the Children go to her mums for tea I went to say goodnight to them before I left as they wouldn't be home- when I got to her mums the OM was there with My WW and the children- this was a boundary we had discussed- i.e. in her own time I cannot control her- but I would not allow her to spend time with him in front of the Children until we had decided what we were doing and began to speak with the children. I knocked on the door and was threatened and assaulted and although I remained calm I wanted to see my children. My W said that after the Weekend she wanted a D anyway, I said that is her choice but we did agree about her not seeing the OM while my C were there- and she said it was none of my business. The OM then pushed past her and began to push me and threaten me, and I kept calm and turned and walked away as I could hear the C crying in the background. I then rang her to ask her what was going on, and he answered and threatened me and made accusations. Since then she has not called, text or engaged in any contact and is still at her parents while I am home. I saw the eldest 2 children yesterday for a few hours, and the little one for 5 minutes. I am now totally lost- and I don't think I would even want the M if she can do this to me I am so desperately down right now