"I have not intention of making my life more complicated by getting involved with another woman."
or
"The last thing I need in my life right now is to make it more complicated by getting involved with another woman"
I think you handled things good. If you didn't, might want to use protection going forward. I would also "be different" in bed next time. Surprise her.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712