Boyfriend might need to undergo heart surgery and talking about not potentially making it and it’s scaring me, don’t know what to do?

I met my boyfriend 3 months back and we’ve been together since. Had a bunch of ups and downs but he’s been amazing and probably the best of guys I’ve dated or fucked around with. He did mention under going heart surgery when he was younger and how he had lost an older sibling to the same condition. Now his problems are resurfacing and he is traveling to his home country to get it checked and potentially undergo surgery. He won’t tell me the complete details but the matter is serious. Now he’s talking about things like not making it, how I need to promise I’ll move on if he passes and that he left a letter for me with his roommate in the event things don’t go as planned. I am losing my marbles because we barely got to spend time the last two weeks because of other circumstances and now I will only see him once tomorrow before he flies out sometime this week. I’m absolutely scared to lose him and I don’t know what to do.

Boyfriend might need to undergo heart surgery and talking about not potentially making it and it’s scaring me, don’t know what to do?
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