Tori respects Beck and Jade's relationship despite kissing him in the Pilot.They seem to be the most normal ones out of all the characters. (See: Bori) (2008-present: Friend) Though Cat and Beck do not have many scenes together, it is likely that they are very good friends (as they've known each other for years prior to the start of the show) and they are seen sitting together at lunch often.
Beck, just like everyone else, seems to find Cat harmless and amusing.
In Locked Up, he was the one to hold the door open for everyone and guide them to the truck to escape, and in the episode Helen Back Again he was the one to take charge and tell Helen that Tori should stay at Hollywood Arts.
He also seems to be quite protective of the gang, especially with Jade.
Cat says she admires Beck and thinks he has great hair. Also, because she and Cat are best friends, Beck's ex-girlfriend, Jade, has never once shown any signs of jealousy when Beck and Cat are shown together.
In Andre's Horrible Girl, Beck is seen protecting Cat from the earthquake.