The relationship has been poorly written from the get go. It had great potential but the writers in my opinion have constantly pissed that away. We got tons of Gwen and Rhys but instead of Jack and Ianto we get Jack and Gwen, Jack and wooden quilt etc. I thought that might change in series 3 what with the publicity with the two of them and the cast and crew saying how people would be happy etc with what happened. I assume the latter was a lie to misdirect people because I can't imagine they thought Jack and Ianto fans would like Ianto getting killed (though we are talking about the people who thought the date rape spray was a good idea). Whilst the relationship has been as neglected and underwritten as ever this series. Two minutes of Jack blubbing is not relationship development.