Wrong about Him

Born of a sort of prompt I saw on Tumblr;

“Tom’s [...] girlfriend[...] is upset with him.
They never really know what he expects or gives to their relationship. Everything seems to be just going along, but they aren’t sure if Tom really wants to be involved or if it is just convenience/fun. Struggling between their own life without Tom and the times when he is around, they come to a decision and tell Tom about it.”