▁like ▁an ▁" old ▁married ▁couple ". ▁Although ▁they ▁seem ▁like ▁polar ▁oppos ites — for ▁example , ▁McG ar rett ▁keeps ▁his ▁house ▁neat ▁and ▁tid y ▁and ▁keeps ▁his ▁emot ions ▁bott led ▁up ▁while ▁D anny ▁is ▁shown ▁to ▁be ▁a ▁s lob ▁and ▁often ▁vocal izes ▁his ▁fr ustr ations ▁by ▁r ant ing — they ▁form ▁an ▁unlikely ▁friendship , ▁with ▁McG ar rett ▁mock ing ▁D anny ▁in ▁his ▁dead pan ▁humor ▁several ▁times ▁about ▁how ▁the ▁latter ▁miss es ▁him ▁secret ly ▁but ▁ref uses ▁to ▁admit ▁it . ▁Although ▁he ▁is ▁often ▁referred ▁to ▁as ▁" B oss " ▁by ▁the ▁other ▁members ▁of ▁Five - 0 ▁and ▁he ▁is ▁usually ▁seen ▁giving ▁orders , ▁he ▁cons iders ▁the ▁other ▁members ▁of ▁the ▁team ▁as ▁his ▁pe ers ▁and ▁oh ana ▁( family ), ▁as ▁mentioned ▁in ▁the ▁Season ▁ 5 ▁premi ere . ▁ ▁McG ar rett ▁was ▁in ▁a ▁long - term ▁on - and - off ▁relationship ▁with ▁Catherine ▁Roll ins ▁( Mich elle ▁B orth ), ▁a ▁re kind led ▁old ▁fl ame ▁introduced ▁early ▁in ▁season ▁ 1 . ▁In ▁season ▁ 8 , ▁it ▁is ▁revealed ▁that ▁his ▁rom antic ▁relationship ▁with ▁Catherine ▁dates ▁back ▁to ▁ 2 0 0 2 - e ight ▁years ▁prior ▁to ▁the ▁events ▁of ▁the ▁pilot . ▁Early ▁in ▁season ▁ 6 , ▁she ▁leaves ▁on ▁a ▁class ified ▁C IA ▁operation ▁before ▁he ' s ▁able ▁to ▁propose ▁to ▁her . ▁He