propose /prəˈpəʊz/
(verb) to suggest a plan, an idea, etc. for people to think about and decide on
Example: He proposed changing the name of the company.

crush /krʌʃ/
(verb) to press something so hard that it is damaged or injured, or loses its shape
Example: My dress got crushed in my suitcase.

love /lʌv/
(noun) a very strong feeling of liking and caring for somebody/something, especially a member of your family or a friend
Example: I love to go out dancing.

first love
first love /fəːst lʌv/
Example: He's my first love.

unrequited love
unrequited love /ʌnrɪˈkwʌɪtɪd lʌv/
(noun) is love that is not openly reciprocated or understood as such by the beloved
Example: Only so many poems can be written about unrequited love.

love triangle
love triangle /ˈlʌv traɪæŋɡl/
(noun) a situation that involves three people, each of whom loves at least one of the others, for example a married woman, her husband, and another person that she loves
Example: He cheated her. He was in a love triangle.

lovesick /ˈlʌvsɪk/
(adjective) unable to think clearly or behave in a sensible way because you are in love with somebody, especially somebody who is not in love with you
Example: I wanted to sigh like some lovesick schoolgirl.

lovelorn /ˈlʌvlɔːrn/
(adjective) unhappy because the person you love does not love you
Example: There are two poor lovelorn souls here who don't fit in.

lovey-dovey /ˌlʌvi ˈdʌvi/
(adjective) expressing romantic love in a way that is slightly silly
Example: A young couple was in there acting lovey-dovey.

flirt /flɜːrt/
(verb) to behave towards somebody as if you find them sexually attractive, without seriously wanting to have a relationship with them
Example: She's trying to flirt him.

break up (with someone)
break up (with someone) /breɪk ʌp/
(phr v.) to separate into smaller pieces
Example: They broke up after 5 years in a relationship.