I sometimes feel sorry for Gideon in that he has never really had a steady relationship and I can't imagine that the relationship with Corrine was as intense as he had with Eva to begin with and probably Corrine excepted him not calling, after all they were in College and studying so they probably could go a couple of days with no contact so probably Gideon feels that this was normal for couples so never for 1 minute thought that Eva would think they were over as he didn't.
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I also think that he felt that Eva would not think it was over because she knew he loved her so much and that she loved him and that was all that was keeping him going at time and what drove him to kill Nathan, his love for Eva and wanting to keep her safe, she was everything to him.Â