No, he didn't feel that he had to explain why he had come at all, since it should have been obvious by now. The bond would only allow them so long of a separation before it began to hurt, and while they worked at SHIELD it was fine since their proximity at times eased the strain of not taking their bond further. Now he had been gone too long to survive and heal, and he was back to get that little taste of the bond so he could slip away again, aware that she would never follow just as he wouldn't.

"Well it's good to know you've found the perks of this whole thing," he replied with a chuckle. "You could save the world a whole bunch of trouble and off yourself and force me to go wit you if it meant that much to you." He couldn't kill her after all; the bond refused to allow him to do more than hurt her a bit, accidental or otherwise.

He stepped aside to let her pass him by, tilting his head as if to avoid getting to close. There was the momentary thrill of her passing so closely to him but it was gone once she had moved out of close proximity again. "I hope I don't have to fake some manner of jealousy. I'm pretty vengeful you know."