Every single trans individual's experience is different, but often there are similarities.
My own situation mirrored Kathy's to a great degree, with the exception that I never expressly told her. She simply knew something was wrong by my frequent failures at trying to function as a male. And now she knows, so we're on the road to being done.
And yet, looking back, I ultimately had to come out and face myself, and in facing myself choose to begin transition. I've lost my spouse, both of my sons, their spouses, their children, and one brother. I've kept my daughter, two brothers, and a sister. When I evaluate my own peace of mind, it has been worth it to me.
Only you can decide what losses are acceptable or not acceptable, but I would warn you, that continuing to lie to yourself is ultimately destructive. Whatever you choose, at least choose truth for yourself. My lies almost destroyed me. Never again.