<human>: Can you provide a brief rundown of the text in within 3 sentences?

First of all, obviously this is posted on a second account.

My girlfriend and I have lived together for four years, we live in a flat which we own, we have a daughter, a car, work... a good life really. But sometime back in April I found out, by reading her diary, that she has an affair with another man. I don't know why I did read her diary, I wouldn't normally do that, but I guess I felt something wasn't quite right. And I was correct.

Now "common sense" told me I should confront her right away, but here I am half a year later, and she doesn't know I know anything at all. I have kept reading her diary since I found out, and she still sleeps with that other guy. I don't know what keeps me from confronting her -- maybe it is to protect our daughter? Because I enjoy the free time I get when she's on her "evening walks"? Or maybe it's because I don't want to leave the good life we are living right now? If we part, we have to sell what we have and probably rent places to live (and that's very expensive over here).

Truth is, deep inside I don't really care about it at all. Sure, it hurts me seeing pictures of him on Facebook, or hearing her phone go, knowing what's in the message. But I don't know if it's worth it. I have kind of settled with it. In a strange way.

Am I living in a broken relationship leading nowhere, or is it possible to keep living like this without breaking down eventually? Will her infidelity end if I don't confront her with it, or do I have to do it in order for it to stop? Is it possible to stick together after a confrontation? I feel like our relationship is a facade. She's having an affair, I know about it, yet we both behave like the other knows nothing. Everything about this relationship is based off lies. And I don't know if I want to tear this facade down or keep living like this. Is it even possible to live like this? I need input...
<bot>: She's cheating, I am aware of it, she doesn't know I am aware of it, and I don't know if I care. Can we live like this?