▁having ▁any ▁connection ▁with ▁the ▁remains ▁and ▁Mac ▁displays ▁his ▁trust ▁in ▁him ▁by ▁telling ▁him ▁" I ▁believe ▁you ". ▁Lou ie ▁is ▁later ▁be aten ▁up ▁as ▁ret ribution ▁and ▁Mac ▁is ▁the ▁first ▁person ▁D anny ▁conf ides ▁in . ▁D anny , ▁however , ▁is ▁the ▁last ▁to ▁find ▁out ▁about ▁the ▁rom ance ▁between ▁Mac ▁and ▁P ey ton ▁( ep is ode ▁ 3 . 1 6 , ▁" He art ▁of ▁G lass "). ▁Mac ▁was ▁a ▁witness ▁at ▁D anny ' s ▁marriage ▁ceremony ▁to ▁L inds ay ▁Mon roe ▁and ▁the ▁god father ▁of ▁their ▁daughter ▁Lucy . ▁ ▁In ▁season ▁three , ▁he ▁is ▁revealed ▁to ▁have ▁been ▁d ating ▁Dr . ▁P ey ton ▁D ris coll , ▁one ▁of ▁the ▁medical ▁exam in ers . ▁His ▁relationship ▁with ▁P ey ton ▁has ▁not ▁been ▁easy ; ▁his ▁ins istence ▁that ▁they ▁keep ▁their ▁relationship ▁under ▁wra ps ▁at ▁the ▁lab ▁conflicts ▁with ▁her ▁desire ▁to ▁be ▁less ▁secret ive ▁about ▁them . ▁A ▁particularly ▁t ense ▁moment ▁occurs ▁during ▁episode ▁ 3 . 1 1 ▁" R ais ing ▁Sh ane " ▁when , ▁during ▁a ▁debate ▁about ▁the ▁state ▁of ▁their ▁relationship , ▁Mac ▁accident ally ▁calls ▁P ey ton ▁" Cla ire ", ▁which ▁causes ▁her ▁to ▁walk ▁out ▁on ▁him ▁( some what ▁ir onic ▁in ▁light ▁of ▁P ey ton ▁being ▁played ▁by ▁actress ▁Cla ire ▁For l ani ). ▁The ▁two ▁recon cile ▁with ▁a ▁h