Sorry for the long post, I don't want to drip-feed.
My wife and I have been married for 15 years and have 3 young dcs, we had both always worked, and having turned 40 my wife decided she wanted to act on the feeling of attraction that she'd started feeling towards women. I feel cold.
Over the summer dw fell a little bit in love with a local mother; unrequited but lots of days/nights out - children forgotten at the school gate - and quite desperate one way affection from my dw.
It became apparent to all this was more than a friendship from dw's perspective but insignificant to the object of her affection. My wife went through a very angry time - shouting at the dc's and me, and our sex life darkened with a kind of aggression I don't enjoy. DW looked unwell, and after visiting the GP she was prescribed anti-depresents and sought counselling.
Fast forward to now - my wife's job has gone - and following counselling she has justified finding a special friend with whom to 'explore' sexually. She has been open with me about the process from going online through to meeting up, finding a woman, and having sex, but I still view this as infidelity and a betrayal. To me it doesn't matter that she's being unfaithful with a woman, unfaithful is unfaithful and gender doesn't matter. But to her this is necessary exploration, and without it she will loose her mind. When I tell her this isn't what I want she tells me that I can find a 'special friend' too but she would find this difficult and that this would truly be infidelity, because anything that another woman could provide she will provide for me. If I 'cheat' she says I would lose the moral high ground. But I don't want another woman, or care about 'being right'.
I feel broken. My father was repeatedly unfaithful to my mother when I was young, it led to my mother dying through an alcohol related illness. I can't repeat this pattern or jeopardise my children.
But I don't want to lose the beautiful lady I have had by my side for nearly half my life, nor see her crushed under the weight of unrecognised sexuality. I feel less - for her, and our marriage - each day she does this, and also lesser myself for accepting it. What can I do ?