Len gave him enough room to move around in his arms but he was back to holding him close the moment he could. Forehead to forehead he could see the emotions play over Barry's face. The tension, the grief, the anger. More than he should have to feel at once and the worst part was knowing there really wasn't anything he could say to make it easier. If Barry really was supposed to die then it was going to happen when he was sent back. Cold, hard truth. And if he was sent back too he'd probably never even know until it was too late.
"You made a difference in me," he pointed out after a moment. "And in other people. It doesn't make it easier, or fair. But you've made a difference Barry. Not just because you're the Flash. The Flash didn't inspire me to be better. You did that."
Len shifted his head a little bit so he could kiss Barry's forehead, try and reassure him. He wasn't always one for sentimental gestures but he was learning and Barry deserved at least that much rom him. Those last five words only made him hold the younger man tighter.
"I know," the urge to say 'and I'm sorry' was there but he knew it would ring hollow. Barry didn't need apologies. He needed to enjoy whatever time he had, so what he said next was even more important.
"I.. love you, Barry. I hope you know that. I'm not good, with this. With words like that. But I don't say what I don't mean, not when it counts. And for whatever time we're allowed here I'll be there. If you want to get angry, or upset, whatever you need." Being selfish came easy. Living for someone else was a lot harder. But given what Barry was facing he knew he had to try.