love at first sight	love began the first moment they saw each other
to fall head over heels in love	to fall deeply and madly in love
to only have eyes for	to be only attracted to
platonic relationship	affectionate relationship between people of the opposite sex that is no sexual
to be infatuated with	be romantically obsessed with
to be besotted with	to be almost stupidly or blindly in lobe with
to hit it off	to like each other the moment you meet
soulmates	people who feel close to each other in spirit and who understand each other deeply
lifelong companion	friend who was with you all your life
a man/woman after one's own heart	sb tou admire because they do or think the same as you
to get on like a house on fire	to have a very good, enjoyable relationship
to be bosom friends/buddies/pals	to be very close, good friends
to be inseparable	always want to be together, very close
a close bond between A&B	a close relationship or feeling of togetherness between A&B
kindred spirits	people similar to each other in the way they think and look at life
well-matched couple	perfect couple
family ties	więzy rodzinne
affectionate, uczuciowy/czuły	affection (przymiotnik, znaczenie)
amiable, uprzejmy	amiability (przymiotnik, znaczenie)
considerate, troskliwy/delikatny	consideration (przymiotnik, znaczenie)
faithful, wierny	faithfulness (przymiotnik, znaczenie)
fond, czuły/kochający	fondness (przymiotnik, znaczenie)
loyal, lojalny	loyalty (przymiotnik, znaczenie)
passionate, namiętny	passion (przymiotnik, znaczenie)
devoted, oddany	devotion (przymiotnik, znaczenie)
respectful, pełen szacunku	respect (przymiotnik, znaczenie)
romantic, romantyczny	romance (przymiotnik, znaczenie)
supportive, pomocny	support
trusting (ufny) / trustworthy (godny zaufania)	trust
to	be devoted... (which preposition?)
for	to have respect... (which preposition?)
to	to be loyal... (which preposition?)
of	to be supportive... (which preposition?)
of	to be fond... (which preposition?)
in	to put trust... (which preposition?)