so similar as to be indistinguishable or nearly so
two peas in a pod
People who have agreed to get married
engaged
to start a romantic relationship - meet
get together
Start to love someone
Fall in love
Get along well with someone right from the beginning
Hit it off
Get married
tie the Knot
A date with someone you've never met
Blind date
Ask someone to marry
propose
an argument over something that is not important
squabble
Date someone regularly over a period of time
Go steady
Be very much in love
Head over heels
Be infatuated
Have a crush on someone
To see someone other than your boyfriend, girlfriend etc..
cheat
Someone you are going to marry
Fiance
Seeing someone
Dating
love at first
sight
Sad because a relationship has ended
Broken hearted
Share a bill on a date
Go Dutch
Stop going out with someone
Break up