Me [29 F] Found out my wife [35 F] has been hiding that she has cervical cancer from me for I don't know how long

First: to clarify not being knowledgeable about the health of female organs, I'm trans female, and unfortunately never had them myself.
I was driving with my wife yesterday, and she asked me to program her GPS to get home. I take her phone, and at that moment, a friend of hers texted, popping up on the screen and mentioning cancer. I ask my wife who has cancer and she just starts crying. I don't know how long she's been keeping it from me, but we've known about a growth in her parts that she told me was benign, but causing issues leading to needing a hysterectomy, but again, assured me it wasn't cancer, and it wasn't a big deal. I decided to trust her.
Now, weeks before the surgery, I find out she basically never planned on telling me. We only talked about it for like 5 minutes, before she insisted she didn't want it to be a big deal, so we dropped it.
It's eating me alive inside. My wife has cancer, didn't think it was important to tell me, and I feel betrayed, and I feel horrible for feeling this way. I'm supportive and definitely here for her, but it's making me question our relationship as well. If it had gotten worse, I might not have found out until it was at a much less treatable point. Apparently her doctor says the hysterectomy will remove it fully, but I don't know if I can believe that now either.
I just feel betrayed, and like I'm working with this alone, because she doesn't want to talk about it and doesn't want other people to know. No one knows my Dating.mobi account, so posting on here is fairly anonymous.

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tl;dr: Wife has been hiding from me for months if not over a year that she has cancer, and I only found out by accident. I don't think she ever planned on telling me.


Source.