My FP is mad at me because I'm an asshole who start petty arguments. We got into an argument over something that doesn't matter and he left in the middle of it, and he went outside. I knew he went outside cause he told me before the argument he was going to go outside at some point. 


At first I was super pissed at him for walking away cause it was childish and he hadn't said something like "I'm going to walk away because I don't want to do this" he just left, no warning. So I called him immature and basically just texted him some mean shit. My anger quickly turned to paranoia and anxiety and I texted him again begging him not to hate me. He's come back and apologized for being immature but I'm on the verge of a panic attack and I don't know how to calm down. I also haven't responded to him because I don't want to snap at him. Any advice on how to respond? Or how to calm down? Anything would be appreciated