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???? What the hell are you on about? Wasn't it clear that the rumours of the heroes getting married was fake in order to calm the public? The heroes disappeared due to the demon king. It's all linked to the past life of our heroine who turns out to be someone who was originally isekai'd into their world.
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https://www.alphapolis.co.jp/manga/official/657000190 here you go
I know there's also the light novel but apart from the covers, I've yet to see the raws or any translation projects on that one. I just know that the illustration covers have both the current hero and mc together Just type in '今度こそ幸せになります!'
If that thing happens to me three times then I wouldn't get close to the hero and would prefer to live a happy life away from the drama and the hero. I know some people may disagree, but that's my honest opinion and why suffer for a man who might never come back to. This may be seen as being a coward but who would really understand the MC who suffers time and time again and if this keeps going then she will think if herself unwanted and break. ┗( T﹏T )┛