My (29M) fiancé (31F) asked me a silly question. I answered her as sarcastically as I could. She's now upset. How do I make her feel better and save our marriage before it even starts?

I have a silly fiancé, and our engagement has been going well except for one point which has left her crying and a screaming. I am having trouble figuring out what to do.<br><br>We've been together 11 years. And we have experienced every possible side and roadblock a couple can enjoy. Always together.<br><br>for context, while we have been together 11 years, we are still a young couple. We live to joke around we are sarcastic and enjoy making fun of each other, as much as we enjoy loving each other. We are unapologetically weird and we love it. We enjoy stupidity around each other, and nothing is sacred when we speak with each other. And most of the time, we are ok with that. It comes with its road bumps but we enjoy what we have together.<br><br>To the incident: yesterday, we were conversing and planning what we're gonna do about our apartment once we get married.<br>some background: we are currently living in an apartment my fiancé owns. It was left to her by her late grandfather, and in order to inherit the apartment, she had to live in it, at least for 3 years. She has now lived in it for 6 years and was finally allowed to sell it. We've discussed what to do with the apartment once we get married (the idea being she would sell it to a good buyer so we can have something to start our life together).<br>She asked me what she should to with the apartment after we get married. With a smile on my face, and a sarcastic tone, I answered; "well you could demolish it?"<br><br>That was enough to trigger a full-blown melt down from her side. She started crying and was screaming at me that I was a horrible fiancé. How dare I say the apartment her late grandfather left her, where she grew up, something so horrible. That this was so important to her. And how I'm a horrible person for being so callous. And how she didn't know if she wanted to marry someone like me who is so heartless and cruel.<br><br>I was speechless, and I didn't know what to say. I just took to saying sorry, as much as I could. But it didn't seem to do much, and she was not to be swayed. She's gone to her parents place for now to calm down.<br>I just want to be able to make her feel better and make her feel safe from my cruel mouth in the future. But I am confused by what she means, and I am having a hard time figuring out how to make her feel better. She is usually a very tough girl, and it doesn't take much to make her feel better. I'm not sure what to say here, and in this case, I have a feeling she may actually call off the wedding.<br><br>What can I say to make her feel better, and show her I'm not a heartless asshole?<br><br>&#x200B;<br><br>tl/dr: my fiancé asked me a question, I answered sarcastically and she is now very upset that I answered the way I did.