My wife told me I'm replaceable and I had a heart attack, what did I do to deserve this?

Anonymous
I (40m) have been married to my wife (31f) for 5 years, and we have known each other for 10. A few weeks ago, we had an argument, and during our disagreement, she told me that I am replaceable. After our argument, she went out with her friends. I have been dealing with some health problems for a while, and the argument stressed me out, leaving me nervous and unwell. I was alone in the house and decided to call the paramedics because I felt that something was really wrong. To sum up, I suffered a heart attack.

In the hospital, they tried to reach my wife, but she didn't respond, likely still upset from our argument. She called later, after coming home, when she found out that I'm not there. After learning of my condition, she came to see me and stayed with me the entire time, constantly crying and holding my hands. After being sent home, she did everything so I could recover faster. However, despite her efforts, I couldn't stop thinking about how she had told me that I'm replaceable. I constantly think about it, I want to confront her about it, but I don't think I'm ready.

Let's also adress the elephant in the room. We had argument about our house, some issues with it, after that we also discussed our priorities, careers and intimacy. At one point discussion was replaced by her venting and saying things not even related to original discussion. I had no issues with her ranting about things until she told me that I'm replaceable.
My wife told me I'm replaceable and I had a heart attack, what did I do to deserve this?
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