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