We're never getting back together-How do you cope?

[onedge]

I think that going dark on W is the best option now. I'm able to control what i say a bit, but it isn't good when we talk at the moment. I need to tell her off aswell.
She used me as an excuse to have S's birthday party tonight, Her "emotional affair" guy is busy on saturday so she wanted it on friday so he could come, a whole lot of other stuff happened, and somehow I got thrown in there aswell.
I'm not going to do it face to face, I will need to do it on chat because any face to face contact that we have at the moment that has to do with us is bad, even over the phone.
Basicly I'm probably going to say,
"don't use me as an excuse again, I would have let you before, but I am not going to let you do it again. You can't just think that because I still want to be with you, I will do whatever you want. It's not going to happen anymore"

I think thats about the jist of it. Any ideas on the wording? and is it something that I should say in person, no matter how hard it is?

Also, the party is tonight, I'm going to do the best I can, but be prepared for a sad and sorry couple of posts later though. Wish me luck