If a heart only shows a horizontal line, does it mean the owner can’t marry?

Should he believe that omen or treat it as baseless by having a relationship with a girl even if he is empty-hearted by nature? Add the factor that the girl is desperately in love with him. What to do now if you’re the man? How to approach this. In my opinion, if the man decides to go for it, it may be hurtful for both in the end. But the other choice will be too depriving for the girl in love.