boyfriend with cardiac problems

Hi, I need some expert advice. I have met a guy thru online dating and he is having some cardiac problems. I need some advice about the nature/severity of his issues before I jump into a relationship. We are both in early 50's, exercise, no smoking, eat right. He has a-fib and has had an ablation but it doesn't seem to have solved his problems. He has needed to be cardioverted twice in the last month after going into flutter, and the last time the doc said he's considering another ablation. He's on several meds, I know one of them is sotolol. I don't have the cardiac background/expertise to evaluate how serious this is. He keeps saying how it's minor, how his doctor just likes him as a patient and is keeping him around (which I don't buy, as a provider myself). Is he at risk of going into arrest if we get to the point of intimacy? Should I be concerned? If we proceed to a relationship, do I need to get an AED? Is he looking at early disability? Please, cardiac nurses, help me sort this out. Thanks so much in advance.