Alhaitham loves you, it's just that he already has a girlfriend. But you are married to Kaveh, and Kaveh is a friend of Alhaitham because before that you three were friends.

Alhaitham is dating his current girlfriend not because of love, but because Alhaitham is trying to cover up his love and pain for you.

Alhaitham looks at you and smiles gently seeing your beauty in a wedding dress, he thinks he should be your companion in life and not Kaveh