Personally, I do not support a friend dating OP while M and I also don't support a friend dating while M with a M OP.
That said, I would support my friend, but I would not support the A.
When ever I've come across this (which thankfully isn't often), I make my point and simply recommend the friend break of the R until both are not M, and otherwise continue to hang with friend outside of any A they might have...
I don't envy your position.
One question, though.
Do you want to support your W... or do you want to support your friend and his A?
