Ditto on KGrow's comments... on everyone's, really, but I wanted to add:

Friends don't treat each other in a way that would lead to divorce. WHATEVER caused the divorce, it's NOT a friendly gesture. In a perfect world, we could say, "oops, didn't mean to get married to a person I couldn't stay married to... let's just have a do-over and not DO this part of our friendship... no more intimate romantic stuff, but the rest was all good"... But divorce kind of wrecks the perfect world fantasies, doesn't it?