Apology letter to FriendIgnoring Messages for Half a Day

I'm sorry I ignored you for half the day. I know you sat there missing me and ended up sulking, and that makes me feel awful. I didn't text because I was being lazy and didn't feel like messaging, and that's on me — not you. I can see how that made you feel unimportant and worried, especially after almost two years of us being close online. You deserve better than disappearing without a word. I take full responsibility for hurting you by not showing up when you expected me to. I want to do better. From now on I'll send a quick note if I need a break instead of going quiet — even a short “I need some time, back later” will be my default. I'll also set a reminder to check in when I say I will, and if I ever feel like not talking, I'll be honest about it so you don't have to guess. If you want, I can make time tonight for a call or a longer chat so we can reconnect. I care about you and our friendship, and I don't want you to be left wondering because of my laziness. Tell me how you’d like me to make this up or if you need space first. I’m here to listen and to fix this, however you want to handle it.