The tears aren't unexpected, and for a moment, Gwen simply lets Rob have it out, still petting consolingly against his hair. She'll not shush him or ask him not to cry, not unless it physically hurts him, because she understands that sometimes you just need to have a good cry out.

"Sod him," she replies decisively of the Doctor. "He's been part of the reason I couldn't sleep. You and I will lay here together and not worry about it." Even if she melts in the process.