<human>: I think they both occasionally reddit so I want to keep the details minimal. I've known the girl for much longer, she's basically family, so she gets my loyalty, but the guy is a decent sort and no one deserves to have their hearts shredded in public.

He's blissfully clueless and thinks their life together is grand, but she has said on several occasions that she isn't sure there is a future. She gets alarmed to the point of panic if someone suggests they might get married. She says she's tried to talk to him about their relationship and he doesn't think anything is wrong, but knowing her, she probably wasn't forceful enough. She tends to be soft spoken and avoids confrontation that could lead to drama and tears. 

The guy is planning a very public proposal where most of his family will be present. I can't even imagine the pressure that she would be under to say yes or the horrible response and possible backlash when she says no.

I feel like I should warn the poor guy not to do it, but that would clearly highlight relationship issues that he doesn't know he has. Or maybe I should tell her what he's planning and to avoid the event. But that would be me sticking my nose into a relationship that I haven't been invited to advise on. 

Does knowing the train wreck is coming obligate me to doing something? or should I just brace myself and let the drama unfold? It feels wrong to just stand by and watch two people irrevocably destroy their relationship just because they haven't figured out how to talk through things. 

What do reddit?

Give me the gist of the text in a nutshell
<bot>: I know the future, he will ask, she will say no, everyone will be super sad, and people will be scarred for years. What do?