First off, this is whole opinion about Sam and Freddie's relationship.

What Sam does:

1. Decides she does not have the nerve to tell Freddie how she feels so she picks on him.
2. Gets up the courage to tell him how she feels...
3. Sees him and Carly together and think, i shouldn't do it.

What Freddie does:
1. Forceabley tells himself and others that he likes Carly, to hide that he likes Sam.
2. Has a one second'special moment' with Carly
3. Sees Sam, and backs away

If you've seen the Seddie 视频 on here, it is obvious that Sam and Freddie like each other, anyways they did willingly kiss!