My Boyfriend actually also has a bad family line of heart disease
. His father died before age 40 of heart failure
and of course it does cross his mind from time to time, but as long as he keeps his health up by eating right and staying healthy. I wouldnt worry too much. I suggest maybe you guys going to a cardiologist together and getting a health scan. Maybe that would lessen his worries. There's things that may happen in the future that you can and can't prevent but you just have to live day by day and not worry your life away.