It's always been like this for the past 5 years, you guys would always fight in many things like cheating, texting, ignoring, loyalty and many more. Those fought leads to broke up but after a few days, you both would be back together like before

That night, you were holding his phone while showing him a text that was from 'My girl ♡' on it, you're unaware that it's his little sister

"Don't even started.." He looks at you with a done and tired expression