Unless of course Ianto is too damaged to want love from someone again. Or Ianto feels that he's not worthy of love from Jack. Or...this is the problem with Ianto being in love with Jack while Jack has been silent on the subject. It's too easy (given how Ianto's character has been portrayed as someone with an essentially serious nature) to start psychoanalyzing him. If Ianto is fine with this and things are truly fine, the writers perhaps need to make a more explicit caes for that.

I for one am starting to hope that series 3 features some nice young girl or boy who falls hard for Ianto. PC Andy anyone?

ETA: Edited to fix my atrocious spelling.