What's a red flag (in a partner) that you completely ignored?

I start first: I had massive pain on two of my teeth. Pain was spreading to my entire face. Some sort of infection. Couldn't even talk. He was next to me, playing video-games. Opened a note on my phone and wrote :call the ambulance, please. He said he wouldn't do that because the nurses/doctors would laugh. My pain was not reason enough to call ambulance.
Second red flag : I was at his place over night. Sudden allergy started and I could not breathe. Mostly whistling , feeling my throat itchy, my eyes watering. I told him I could not breathe. He was angry and asked what the f**k I want him to do about it? Building a BA? There are many, many other red flags of this person. I could write a book about it.
What's a red flag (in a partner) that you completely ignored?
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