note:

if a guy is interested in a girl, there are some things which you must never, and i mean, never say to her. (even if it was meant to be a joke)

guy: stop eating those chocolates, you are fat!
girl: silence. if looks could kill, he would have been dead.
guy: i was just kidding, you are so thin!

and so, the judgement has been passed and set in stone.

P.S an additional tip, don't go screaming all of that in a room full of people. she is just not going to be able to look beyond that and fall madly in love with you.