Just for the record: I've remained friends with my first ex-husband. (that always sounds so bad when I say it... 'my
first ex-husband', lol...there've been two, just two
) But we've managed to stay good friends over the years. In fact, he's the one who cut my hair last week!
But, as to the OP. I have to agree with those advocating a clean break. "Letting her down easy" is a misnomer. It doesn't actually make things easier...just leaves you in limbo with your up and down emotions, doubts, etc.
It's better to KNOW.