[Margo]

ciekawe jest: Love someone to bits, love-birds, a labour of love

[jackie88]

a zanim ta love nastąpi to :

to sow one's wild oats - wyszaleć się

the relationship może być np. on the rocks or bumpy (kiedy napotkamy trudności )

[tifereth]

no strings attached - bez zobowiązań

[kseniasze]

friends with benefits - najpiekniejszy eufemizm ever. nie bede tlumaczyc

[GosiaS]

a match made in heaven - a couple who get along perfectly

When the two people finally got together it was a match made in heaven and everybody thought that they would stay together forever.

[joannawarda]

love-hate relationship = it involves both hatred and devotion
a relationship where there is no love lost = no feelings of respect, affection, admiration (curious)

and my favorite:
one cannot love and be wise
love will find a way

[aniulkaa]

get hitched - to get married
to have eyes only for = to be attracted to one person only
to be smitten by someone = to be in love with someone

[Mangus]

To be head over heels - in love.

[dagmara7]

puppy love = love between teenagers

to tie the knot= to get married

to call it a day = to agree that the relationship has ended

love is blind = when you love someone, you can't see their faults

[bagawat]

to fancy someone- to find someone attractive
to have a soft spot for someone - to have a weakness for someone
to go steady - to go out with someone
to fall for someone - to fall in love
to be lovey-dovey - for a couple to show everyone how much they are in love
to have eyes only for - to be attracted to one person only