No, I didn't think of what I did as negative. Yes, it created drama and made the husband aware of a "possible" problem in his marriage (I say "possible" because I presented the information in a very factual manner. I said I "believed" there was an affair going on and presented the facts exactly as I knew them).
I feel I did this family a favor. They had a baby and I believe my husband was a threat to their marriage and in turn a threat to the well-being of this child. I let the husband know this so it would give him a chance to try and turn things around and possibly change the course that his marriage was headed.
There is no arriving, ever. It is all a continual becoming.