My pet hate moment in that ep is Gwen patronising her at the end by telling her "love suits you" makes me gag just remembering it.

Poll results are interesting, I voted for straight as I think there is no other evidence in canon for anything else. I do think it was written as poor lonely misunderstood Tosh is feeling awful because the man she loves is shagging the new girl that all the men overlook her for. It's an old trope and I think easy to relate to (well I could, gosh it reminds me of high school)