fall in love (phrase)
/fɔːl ɪn lʌv/

to start to love someone

boyfriend (n)
/ˈbɔɪfrɛnd/

a man or boy who a person is having a romantic or sexual relationship with

girlfriend (n)
/ˈɡɜːrl.frend/

a woman or girl who a person is having a romantic or sexual relationship with

relationship (n)
 /rɪˈleɪ.ʃən.ʃɪp/

a close romantic friendship between two people, often a sexual one

go out (phrasal verb)
/ɡoʊ ɑʊt/

leave the house to go somewhere

kiss (v)
/kɪs/

to touch with your lips

fancy (v)
/ˈfæn·si/

to imagine or think that something is so

interested in (adj phr)
/ˈɪn.trɪs.tɪd ɪn/

showing curiosity or concern about something or someone

crazy about (phrase)
/ˈkreɪ·zi əˈbɑʊt/

to like someone or something very much

flirt with (phrasal verb)
/flɜrt wɪð/

to behave towards somebody as if you find them sexually attractive

adore (v)
/əˈdoʊr/

love intensely

hold hands (phrasal verb)
/həʊld hændˈz/ 

to put your hand around someone else's hand

believe (v)
/bɪˈliv/

to feel certain that something is true or that somebody is telling you the truth

split up (phrasal verb)
/ˈsplɪt.ʌp/

become separated

finish with (phrasal verb)
/ˈfɪn.ɪʃ wɪð/

to stop having a romantic relationship with someone

deny (v)
/dɪˈnaɪ/

to refuse to admit or accept something

fight (v)
/fait/

to struggle physically with somebody

madly (r)
/ˈmæd.li/

(used as intensives) extremely

invite (v)
/ɪnˈvaɪt/

to ask or request someone to go to an event

dinner (n)
/ˈdɪn.ər/ 

the main meal of the day, usually the meal you eat in the evening