A person loving another in a dream, if it is for the sake of God the Exalted, is a sign of meriting the mercy and good pleasure of God, of giving up sins, and of an unbeliever being guided to Islam. If the mutual love is for other than God, it indicates entering a partnership whose result is betrayal, or marrying without a guardian.
Dream meaning · al-Nabulsi
Mutual love (loving another) تحابب الإنسان لغيره
Source: al-Nabulsi, Ta'tir al-Anam fi Ta'bir al-Manam, p. 43. English translation by iDreamBot. Quran verses: Quran.com, Saheeh International.