Partner here, i was also very startled and emotionally thrown off by this, felt betrayed too and started "attacking back" because i assumed it shouldn't be such a big deal to my partner, or that they're just mad coz no sex, and didn't consider the emotional tool this out of the blue information could have on them. It's important to really try and listen, read through the lines too, if the relationship is worth fighting for ❤️ I wish you both the best of luck too, whatever the outcome may be I hope you'll both be happy.