"It is not just fine, Leonard! You have no idea." Okay, perhaps he was milking it. Who cared? He was having fun. "Oh, you're too much for me, are you?" He laughed softly. Not because he thought the idea of Leonard being too much for him was funny, he was just... amused, was all.
"Well, you're not allowed to be dead here," he tells Leonard, suddenly serious. "Even after you broke my heart, I much prefer you living." Yes, Barry was being a bit protective. But if Leonard knew a version of him, and was friendly with that version...