Received a message today from a friend’s exbf, with photos of messages sent between her and my partner. They may not actually have had sex (no evidence) but it was definitely on the agenda. There had been kissing and physical intimacy. These messages are from 3 years ago when DS was 4, and we’ve since had another child. Partner and friend’s ex were also friends of sorts. Friend’s ex had told partner he had evidence and to tell me, else he would. This was most recently discussed a couple of months ago, according to the screenshots I have seen. I haven’t responded to friend’s ex, and don’t intend to. What would you do now?