Why is that reason important?

I was happy as I thought that both family accepted both of us being together. Though is still called 'friends' rather than lovers, but we're together. Suddenly out of no reason, she wanted to stop us. Giving me a reason that sounded damn ridiculous to me. 'If he's sick with diseases than there's NO for me to let you two go on the relationship.' I was angry and couldn't accept that piece of idea. What's the link between that and me and him being together? She said that she doesn't want our children to be the victim, as diseases can be inheritated. Well, bullshit! It's not those totally heredity diseases. Just the risk factor being inheritated. Not the disease. Haiz..This drew me n my love to the lowest level of emotions and mood. Such a ridiculous reason. God! Please make him well and healthy. I don't want her to use that as a weapon against us. My love n me hav made it tis far, this is not the reason to tear us apart. Bless him please for I reali want him to be healthy rather than anything else...