BLAAAHHHHHHHHHH. that should pretty much explain the feeling when it's confirmed you're the person who has the unrequited love and it's not the other way around.
Person 1 : hey, what are you doing on friday?
Person 2 : oh i'm going on a date with Ryan, how about you?
Person 1 : ...i'm uh....
Person 2 : gonna stay home alone like every other weekend HAH HAH HAAAAAA
Person 1 : *muttering foul words under breath*