I hate love triangles. If you could call it one. But then real relationships are perceived as boring onscreen. Owen falls for Diana, she leaves. Once Owen started to feel something real for Tosh, they both die.

I didn't care about that scene where Gwen crying alone in her pizza. Such a pointless scene.

I like to believe Ianto wouldn't fall for Gwen under any circumstances. There has to be a line of realism here. Not everyone is attracted to people they work with.