anyone who never fought (argue) with your partner in early relationship but now you're?

me and my boyfriend never used to fight or call what we had fights. we bicker for 3 seconds then move on. but now recently it's like I can't catch a break I realize it's wrong but I'm used to doing it. anything we argue about he's right. I don't like yelling, screaming, fighting, etc. so I try to end it quickly asap. I know it's wrong but I can't help it. anyway..we used to make up instantly then boom silence not a peep. I am pretty sure it's my fault but I can't wrap my head around what I did wrong. also I know this all sounds like a red flag but truly he is the best boyfriend ever and I know he'd do anything for me as I would him.