It was love at first sight
the experience of starting to be in love with someone as soon as you see them for the first time
soulmate
a person perfectly suited for you
main squeeze
someone's significant other
To have a crush on someone/crushing on someone
you romantically like someone
They are a match made in heaven
A very successful combination of two people or things
Tied the knot/got hitched
got married
Head over heels
Being madly in love
apple of my eye
someone you cherish above everyone else
smitten
be strongly attracted to someone or something
love blind/blinded by love
people do not see the faults of the people that they love.
Pop the question
propose to someone (marriage)
take my breath away
you feel surprise and admiration because it is so beautiful or exciting