Oh boy, thats a tough one. I wouldnt marry the guy because I know it'd be a selfish thing to do and that he'd suffer immensely later on for it, and kids would just be so lost without a mother. Thankfully though we dont have to worry about such things.. I dont know of any heart diseases out there where the doctor could tell you how much time is left of your life.
May God have mercy on us all.
Agar ussay shadi say pehlay pata chalta to? ya phir buchchay honay kay baad.
Allah take care of every one. We can't that is our wrong way of thinking.
That is not selfish to go ahead. If she tells the truth and person after knowing wants to marry her and have kids then it's not selfish at all.
For leaving kid it's a hard thing for me. But again you can't stop a soul to come in this world. You can just cure to try to not to bring but you can't really stop. It's all Allah's control. I also don't like controling myself what Allah made to happen.