That's a heck of a thing for the boyfriend to live with.
This story brought back some bad memories to me. I once kissed my wife after I ate some shrimp. A few hours later, her lips were swollen and she was breaking out in hives. What I didn't know at the time was that she had a number of allergies. Shellfish and peanuts are just two of them. Now, I have to brush my teeth and use mouthwash before I kiss her after eating shellfish and peanut products. Take it from me, these allergies are NOT to be toyed with. They are very real and deadly. I was luckier than this guy was. I feel for him for what he is and will be going through because of this unfortunate event.