▁his ▁possession . ▁Although ▁Amy ▁was ▁initially ▁shock ed , ▁she ▁became ▁really ▁happy ▁to ▁know ▁that ▁Sh eld on ▁lov es ▁her ▁enough ▁to ▁have ▁considered ▁taking ▁that ▁step ▁forward ▁in ▁their ▁relationship . ▁Amy ▁later ▁prepar es ▁a ▁surprise ▁birth day ▁party ▁for ▁Sh eld on , ▁which ▁he ▁has ▁not ▁previously ▁celebrated ▁with ▁the ▁group . ▁ ▁After ▁a ▁pl umb ing ▁accident ▁makes ▁her ▁a partment ▁un in hab itable ▁in ▁season ▁ 1 0 , ▁Sh eld on ▁and ▁Amy ▁emb ark ▁on ▁a ▁five - week ▁experiment ▁living ▁together ▁to ▁test ▁their ▁compatibility . ▁Amy ▁later ▁adm its ▁she ▁li ed ▁about ▁how ▁long ▁the ▁rep airs ▁were ▁taking ▁so ▁that ▁she ▁could ▁continue ▁living ▁with ▁Sh eld on . ▁They ▁eventually ▁move ▁into ▁Pen ny ' s ▁old ▁a partment ▁together , ▁while ▁Pen ny ▁moves ▁in ▁with ▁Leonard , ▁and ▁later ▁make ▁the ▁arrangement ▁permanent . ▁Amy ▁is ▁later ▁offered ▁a ▁three - month ▁course ▁at ▁a ▁science ▁camp ▁in ▁New ▁Jersey ▁and ▁leaves ▁with ▁Sh eld on ' s ▁encourag ement . ▁She ▁becomes ▁angry ▁when ▁she ▁lear ns ▁of ▁Sh eld on ▁sp ending ▁time ▁with ▁Ram ona ▁Now itz ki , ▁who ▁she ▁suspect s ▁has ▁rom antic ▁feelings ▁for ▁Sh eld on ▁( which ▁she ▁does ). ▁In ▁the ▁season ▁finale , ▁after ▁Ram ona ▁kiss es ▁Sh eld on , ▁he ▁vis its ▁Amy ▁and ▁propos es ▁to ▁her . ▁The ▁episode ▁ends ▁on ▁a ▁cl iff h anger ▁await