As much as they missed their friends from the other universe, they had friends in this world.
Jake, for one. The blonde missed both Ricky and Mickey, but liked Chris and had missed Rose when he started jumping between universes. There were a few other Torchwood workers - Sara, Ben, George and Carlie.
Sara and Carlie had been the only two girls who had not flirted with Chris the second he stepped into Torchwood. Ben was Jake's friend and had been since they joined Torchwood. George was in IT, so that he and Chris could converse loudly and rapidly about things none of the rest understood.
They missed the others, but they still had each other.