to be infatuated with; to be enchanted by; to be passionate about

first love

to lose one's love; to break up (in a romantic relationship); to feel jilted

to be secretly in love with

reluctant to leave; to hate to have to go; to recall fondly

heterosexuality; heterosexual love

narcissism

to fall head over heels in love; to be passionately in love

to feel attached to; to long for; to love

bisexual; bisexuality

in love with; to feel deeply attached to

to love each other

to be fondly attached to; to not wish to part with; to cling to

to be in unrequited love with (sb); one-sided love; unrequited love

love and marriage

to miss; to long for

reluctant (to leave, to let go etc)

to be in love when one is too young; puppy love

(slang) to openly express or pursue romantic interest in sb (as opposed to 暗戀|暗恋[an4 lian4])

sentimental attachment to a person or place

improper love affair; unhealthy relationship (age-inappropriate, obsessive, incestuous etc)

to miss; to long for; to remember with longing; yearning

online love affair; cyberdate; Internet dating

painful love affair; sadomasochism

to cling to; to be reluctant to give up (sth); to have a fondness for (an indulgence etc)

love triangle

love between an older woman and a younger man

pederasty

see 婚外情[hun1 wai4 qing2]

long-distance romance; long-distance relationship

romantic relationship with a significant age gap

(sexual) fetishism

sapiosexuality

pansexuality

fig. romantic relationship between an elderly couple; falling in love in the autumn of one's life

(Internet slang) nothing left to live for

change of affection, shift of love (idiom); to change one's feelings to another love; to fall in love with sb else