Larry is talking to his classmate, Hedy.
L: Hey, Hedy! What seems to be bothering you?
H: I don't understand why my boyfriend finds it so hard to keep his word.
L: What has he done this time?
H: Well, he made a date with me to see a movie last night, but he stood me up.
L: What a lousy guy!
H: I know. And there's nothing worse than to be in love with such a guy.
L: Why don't you just dump him?
H: I can't.
L: Why not?
H: I promised I'd never leave him. And a promise is a promise.
L: Oh, boy.

What seems to be bothering(troubling,matter with) you?
I have no idea (about省略) + 名词从句 = I don't understand...
I find that he is a nice man. = I find him a nice man.
I find that it is interesting to learn English. = I find it interesting to learn English.
make an appointment with sb 正式或公务之事      make a date with sb 男女之间的约会
ouch 哎yao  
stand sb up 空等
lousy(俚)-- a poor quality  差劲的
There's nothing worse than ...
Oh,boy. = What a surprise!   好家伙