You're sad now because you feel like you can't live without that person, but if they can live without you, you can live without them.
cubica
cuddy
cucurbitaceous
culiciform
cuculine
cucullate
culet
cucurbit
cullion
culicino
cullet
culm
culmen
culmiferous
cultch
cultriform
cumbent
cumuliform
culverin
culver
culvertage
cultus
cunabula
cumulose
cuneate
cunctation
cuneiform
cuniculous
cupel
cupriferous
cupola
cupuliferous
cupulate
curia
curette
curie
curate
curiology
curiosa
curmurring
curricle
currycomb
curule
curtate
curtal
curtilage
cursorial
curvet
curvicaudate
cuspidor
cusec
custos
cyanotype
cyesis
cyesolagnia
cylix
cyllosis
cymbiform
cymaphen
cymograph
cymometer
cymotrichous
cymophanous
cynanthropy
cynartomachy
cynoclept
cynography
cynegetic
cynology
cynophobia
cynomorphic
cynolatry
cynophilist
cynoid
cynosure
cyphonism
cyprian
cypress
cyprinoid
cypseline
cyrenaic
cystolith
cytheromania
cystoscope
cytogenesis
cytology
cytometer
dystopia
dystocia
dysteleology
dystectic
dacnomania
dacoitage
dacryops
dactylioglyph
dactyliology
dactyliomancy
dactylogram
dactyloid
dactylography
dactylomancy
dactylology
dactylomegaly
dactylonomy
dactyloscopy
daedal
