▁into ▁' lo ve ▁mel anch oly ’ ▁— ▁this ▁is ▁a ▁form ▁of ▁de pression ▁or ▁sad ness . ▁Pass ion ate ▁love ▁is ▁the ▁love ▁in ▁the ▁" h one ym oon ▁phase ", ▁the ▁beginning ▁of ▁new ▁love , ▁but ▁it ▁burn s ▁itself ▁out ▁after ▁a ▁year ▁or ▁two , ▁comp ass ion ate ▁love ▁is ▁what ▁occurs ▁after ▁passion ate ▁love ▁f ades , ▁it ▁is ▁a ▁stronger ▁bond ▁of ▁companion ship . ▁In ▁both ▁cases , ▁lov es ick ness ▁can ▁be ▁experienced ▁if ▁love ▁is ▁lost ▁or ▁un re qu ited . ▁ ▁Love ▁sick ness ▁is ▁not ▁just ▁an ▁expression ▁but ▁has ▁been ▁studied ▁as ▁an ▁actual ▁ill ness . ▁In ▁ 1 9 1 5 , ▁Sig mund ▁Fre ud ▁asked ▁r het or ically , ▁" Is n ' t ▁what ▁we ▁mean ▁by ▁' fall ing ▁in ▁love ' ▁a ▁kind ▁of ▁sick ness ▁and ▁c raz iness , ▁an ▁ill usion , ▁a ▁blind ness ▁to ▁what ▁the ▁loved ▁person ▁is ▁really ▁like ". ▁ ▁Scient ific ▁study ▁on ▁the ▁topic ▁of ▁lov es ick ness ▁has ▁found ▁that ▁those ▁in ▁love ▁experience ▁a ▁kind ▁of ▁high ▁similar ▁to ▁that ▁caused ▁by ▁ill ic it ▁dru gs ▁such ▁as ▁c oca ine . ▁In ▁the ▁brain , ▁certain ▁ne uro trans mit ters ▁— ▁phen eth yl am ine , ▁dop am ine , ▁n ore pine phr ine ▁and ▁o xy to cin ▁— ▁el ic it ▁the ▁feeling ▁of