Jack had many reasons to be angry at The Doctor. He had so many questions that would only lead to more questions with no answers, so he knew that going into the whole thing. After talking to The Doctor on the bulletin board, he had told Gwen & Ianto that he was going to meet with him. The look on Ianto's face was less than thrilled. Jack knew what he was thinking and he assured him that wouldn't be happening again. He knew his place. Jack had had several opportunities to leave with The Doctor and didn't.
He wouldn't now. He had placed a kiss on the baby's head and after fussing for way, way (really, way) too long, he left their apartment and headed out into the night to meet with The Doctor.
Jack felt a clenching in the pit of his stomach and he knew that there were things that had to be answered for. Jack knew that The Doctor couldn't have saved or restored the lives lost; he just wanted to know why he couldn't have helped. And why Jack had make the biggest sacrifice of his own family to to save the world. He wasn't sure he wanted to hear the answer, but he knew it was a question that he had to ask.
He walked the whole way, his coat flapping about his legs. Perhaps it was too warm for it, but the coat was his security blanket. He knew that it was stupid, but it calmed him down to have the coat on. If he said it out loud, it would sound even more ridiculous, so he kept that little tidbit to himself. As he neared the Welcome Center, he could see the familiar blue box parked there. He smiled despite the emotions raging just underneath the surface.
He reached into his coat pocket and dug out the key that he knew was there. As he found himself standing in front of it, he slid his hand along the wood as a silent acknowledgment before using the key to let himself in. It was do or die time. Or just do. He couldn't die. He sucked in a deep breath and pushed the door open, letting himself in and shutting the door behind him. He pressed his back to it and looked around, not making any moves as of yet.