I behaved
halak (haw-lak')
to walk (in a great variety of applications, literally and figuratively)
myself as though he had been my friend
rea` (ray'-ah)
an associate (more or less close) -- brother, companion, fellow, friend, husband, lover, neighbour, (an-)other.
or brother
'ach (awkh)
a brother (used in the widest sense of literal relationship and metaphorical affinity or resemblance (like 1) -- another, brother(-ly); kindred, like, other.
I bowed down
shachach (shaw-khakh')
to sink or depress (reflexive or causative) -- bend, bow (down), bring (cast) down, couch, humble self, be (bring) low, stoop.
heavily
qadar (kaw-dar')
to be ashy, i.e. dark-colored; by implication, to mourn (in sackcloth or sordid garments)
as one that mourneth
'abel (aw-bale')
lamenting -- mourn(-er, -ing).
for his mother
'em (ame)
a mother (as the bond of the family); in a wide sense (both literally and figuratively) -- dam, mother, parting.