Help..

Nia

Me and my Boyfriend are both 14 and we are in a 1year and 8month relationship..but we been nagging at each other recently and just getting mad at each other ONLY OVER TEXT.. In person, we are this lovey dovey, comfortable, healthy relationship but as soon as we part ways, the way we are over text is ridiculous and i need help with that.. idk how to calm him down or anything, I'm usually the one saying sorry to him.. i just wanna stop fighting with him like we are a married couple.. we don't wanna break up cause we love each other like.. LOVE each other.. I just need help in what to say to him to make ourselves to stop fighting with each other.. any tips..?