Howling:In Boom Town, why is the doctor both harsh to and nice to Blon Slitheen?

In some scenes of boom town, the doctor is both nice and harsh to blon slitheen. One example is when they are going to the restaurant you see them holding hand, smiling and by the looks of it having a nice chat however the next scene involves him not being nice. Why? --Coop3 ☎  15:39, June 29, 2013 (UTC)