And why a blood donor is a problem for you? First you should ask yourself what’s the reason that this phrase so scared you and only afterwards decide whether continue dating or not. Maybe you are just afraid of blood that’s why took so fast the decision to quit, but, as for me, this shouldn’t be an obstacle in such a situation. You should have asked her what’s the reason for choosing such a career. Maybe she is eager to help people and this is the way she does it. If so, she should be a wonderful girl. The only thing that may matter here – values. According to an amazing article that I came across not long ago -
https://breakupangels.com/when-is-love-not-enough-in-a-relationship/, in case you can’t find any common ground on your values regarding important things, the relationship will have a hard time lasting. Aligned values are one the most important things in any relationship and they might define the success or failure of it.