My boyfriend, 19M moved into my 17F house about a month ago while awaiting his departure to boot camp. Everything was going good until yesterday. He was nice, caring and gentle and helped me when I was having issues with my family. I truly believe he was being genuine in his actions as well. But yesterday I opened his phone while he was out of the room and scrolled through Reddit. I checked his recently visited subreddits, because he's always been jumpy when I try to use his phone, especially to open Reddit. I found out he has visited several lolicon subreddits and various other pornographic subreddits. My biggest concern is the lolicon. He discussed suffering from porn addiction in the past, but I draw the line at children, even if they are supposedly not minors through some sort of loophole. I was also uncomfortable not only because of the contents of the porn, but because my younger sister 15F lives in our household as well. We have discussed in the past how his porn usage made me uncomfortable and he had promised to quit. I have trauma behind confronting men, so I elected to call him a few hours after and speak to him over the phone while I sat in my car. He seemed genuinely sorry and like he was truly suffering from an addiction, but admitted to seeking out and viewing the porn. I broke up with him and had my father drive him back to his home in a rural area, which he agreed was a good idea. My friend insists I did the right thing by electing to no longer speak to him and have him live in my home, but I can't help but feel that I messed up. Did I overreact? AITA?