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The male lead fell in love over 10 years ago and never fell out of love.
Kouichi fell in love with Miroku at first sight when he was a lot younger than 10 years old, and very soon started planning on marrying the woman he loves! They're one of my favorite couples out of all the couples I have ever seen. They are soulmates.
Not the male lead, but Subaru has been in love with the female lead for 10 years - since they were young kids. He waited 10 years for her and never even kissed anyone else (and he's a famous idol).
He fell in love with her when he was only 5. He proposed (seriously) when he was 5 (he's a wolf, so that was serious), and once he returned after 10 years, he once again proposed marriage. He never wavered from wanting HER to be his mate and wife.
Kowamote Kokosei to Jimikosan