Question: What does Islam say about falling in love? Is that allowed in Islam? If it is yes, how could we show that to the person we love without causing fitnah?
Answer: Islam teaches us to be truthful and realistic. Usually, we love for the sake of Allah and we hate for the sake of Allah. Islam teaches us that a male and female can build up a good relationship founded on marriage.
We do not say love is halal or haram because it is a feeling. Maybe it is not under control. You can judge what is under control. But people who fall in love are in many episodes away from the cleansed and pure atmosphere.
Marriages that are usually good and lasting marriages are those that start at the least affection. That affection grows after marriage and maybe it will grow until the couples continue their companionship at the Jannah.