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The act of falling in love itself is NOT haram simply because it is something which we as humans have no control over. So we will not be held accountable for falling in love, but we
will be held accountable for how we react to that love, wheter we do things the correct way (marriage, talk to Wali etc) or incorrect (Zina, pre-marital relationships etc).
Love is not unknown and the scholars of Islaam have written books on it and discussed this subject deeply, and the first love that is recognized in Islaam is the love between the Messenger (saws) and his wife Aisha r.a..
Mentioned in Bukhari, narrated Abu Uthman:
Allah’s Apostle sent ‘Amr bin Al As as the commander of the troops of Dhat-us-Salasil. ‘Amr bin Al-’As said, “(On my return) I came to the Prophet and said, ‘Which people do you love most?’ He replied, ‘Aisha.’ I said, ‘From amongst the men?’ He replied, ‘Her father (Abu Bakr)’.
Imam Muhammad Ibn Shaab az Zuhri said,
“The first love that was ever recognized and known is the love between Prophet Muhammad (sal Allahu alayhi wa sallam) and A’isha (r.a.)”
The Messenger salalahu alaihiwassalam when speaking about his wife Khadija said:
“Verily, I was filled with love for her.”
Ibn Qayyim says in Jawab Al Kafi:
“When we speak of rulings of love, we must describe two things. One is optional and one is not. The optional love is what leads to love (eyesight, association, etc.) and this is the love that you have to beware of (for it may lead to unlawful acts.) The non optional love, if it happens by the sudden look, or natural passions that develop, you cannot be blamed for it, but it’s how you react to it that Allah will hold you to accountable for.”
So if you love someone, the most correct course is marriage. Talk to the person's Wali and get married Bi'Idhnillah because the Messenger said:
“For those who love each other, nothing has proven as good as marriage.”
(Sunan Ibn Majah)