Responses
Might be thinking about "Struggle" ? Here is the link: https://www.mangago.zone/read-manga/struggle_1/
Might be https://www.mangago.zone/read-manga/percentage_of_love/ ? Its kinda similar and they didn't fight when they separated. Also they meet again a few years later and the ML spots the baby with the MC.
I'm looking for what I assume is an omegaverse (might just be a plain old mpreg) where i assume it starts with the MC having a misunderstanding with the ml. The MC is pregnant and he wants to tell the ml (they are in school btw) that he is pregnant. I can't remember how but the ML thinks the MC is cheating on him and that the baby belongs to the guy who the MC has cheated on him with. (The MC never cheated there was just a misunderstanding)
The ML broke up with MC and the MC left but he ended up keeping the baby. It ends up time skipping a few years into the future when the baby is now a young kid/toddler and goes to a day care by a hospital. The ML works at the hospital if I recall and ends up in an alley way for some reason while he's not feeling good? The kid ends up wandering away and finding ML and talks to him before running back to his daycare where the MC is. This happens like once or twice where the kid ends up running into the ML and talks with him before the MC and ML end up making contact again when the MC ran after his kid.
I can't remember much after that but I do know that they have a happy ending together.