His mouth has fallen open, and he just stares at Rose as she talks and wanders around. He shoots a helpless look at Ianto, then Jack, his brow knitting in hopeless confusion. "But Rose...that's not...you KNOW how I felt about...I was bollocks at showing it, but we've TALKED about..." He looks more and more flustered.
"Now you know perfectly well I had issues back then, I wasn't getting close to anyone, not you, not Jack, then I regenerated and things changed but it was still so hard for me, and we've talked about it all, and you've made jokes about it all and..."
His eyes narrow slightly as he trails off, "...and something funny is going on here."