Procrastination in replying to texts

I have a really sweet friend, but he sends way too many messages. I get so overwhelmed that I don't reply to him. I don't know what is wrong with me. I don't do it with other people, just him. I feel like he is too nice so I always need to give him the sweetest long text replies, and then I procrastinate. The worst part is that when I don't reply him, he keeps on sending even more texts and I keep on feeling terrible. Then when I reply him he comes online so quickly, and I go blank in what to say. For context, the messages are normal like how are you, what are you doing etc etc. And he wants me to react to all of them. We also have 2 hour long video calls every week so I don't know I just run out of things to say. I really feel terrible for not replying to him. It's like I carry a mountain over my head all the time. When it comes to my other friends, I reply them quickly, because the messages are to the point, no extra hearts and emojis and reactions. What I should I do, I know the answer would be to reply him now and feel fine but I guess I am too drained. Sorry about ranting, has anyone else gone through something like this?