 If you liked
Hapi Mari: Happy Marriage!?
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 ...then you might like
Koi wo Oshiete
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In both mangas, the characters are not sure about the real feelings about their partners, in fact, they take a while to realize that they are in love. The difference is that in Hapi Mari, the main character is "forced" to get married due a circumstance and in Koi wo Oshiete the marriage is seen as a consequence of their love.