I think one needs to tell early on but not necessarily first date. Within first few dates. My fiancée told me on a third date. I did see it right away but wasn't sure exact diagnosis ( or if he takes Meds) until he told me. It doesn't bother me much as its nothing that serious. I myself don't have MI, but I've been seeing a t and I told him right away. Overall we shared almost everything important ( like issues) there was to share during first month of dating. Give it few dates and then tell him if you feel it's going somewhere.

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