OK, my friend and her husband have been together for about ten years, no kids, usual ups and downs, but the past couple of years have been harder than most, he has lost jobs etcetc, but they seem to have come through it OK, and both are in good, stable (as much as anything is stable) jobs now.
At a family party 3 months ago, he got really drunk and went off his head at her about really personal stuff in front of her family, she has never given details, and I have never asked, but it really upset her. He has flown off the handle about random, small things a couple of times since then.
A week ago, they were at a Christmas party and he dissapeared for an hour at three in the morning. He was talking on his mobile 6 houses up the road, in the bushes. When my friend asked who it was, he said he would tell her later, and that he knew 'not knowing would kill her until he told her'. He never told her and when she looked at his phone later, it was a really common man's name, but she has never heard him mention this name before.
She also told me that they are having their first ever dry spell of sex.
I said that I would be checking his phone regularly, she replied she doesn't want to breach trust like that and is disgusted with herself for checking it in the first place.
He also went way OTT in Christmas presents for her as well.
I know my alarm bells are really ringing that he is shagging someone else, but I am a paranoid hag, I don't know what to tell her, or if I should say anything more at all, or just be there to support her if he is doing the dirty and he gets caught.
Has anyone got any advice?