Blamed for health problems during pregnancy

Hi guys. I have had a rather rough pregnancy with gestational diabetes and extreme low blood pressure. The low blood pressure makes me pass out at times. My boyfriend tells me that if I would have taken better care of myself before pregnancy....I wouldn't have these health problems. Is anyone else's spouse saying things like this? Diabetes runs really heavy in my family......and my sister has type two diabetes. I really don't think I could have avoided it.