My 30 yr old BF likes HS girls!

About two years ago I confronted my 30 year old boyfriend about him having high school girls as his friends on FB. I’m 25 and I have no interest what so ever to send a high schooler a friend request on Facebook. I have nothing in common with someone in HS and I would think he would feel the same. When I did confront him two years ago he said it was just Facebook. I told him I don’t have HS kids as friends on Facebook because of the age difference and he turned around and said something along the lines like “You think you’re way too mature to add someone from HS as a friend, you’re acting stuck up and like you’re better than people!” His comment didn’t make any sense to me and I tuned around and called him a pedophile 🤷🏽‍♀️ Of course he was angry about my comment but he was making excuses on why he has these high school girls as friends. FAST FORWARD, about two years has pass and his friend list is growing and it’s filled with young girls from high school and some 18-19 year olds. He’s ALWAYS under their pics liking it up and he never ever like my pics. I don’t mean to toot my own horn but I KNOW I look good. The other day he was sleeping and our child, yes he has kids had his cellphone somehow the face detection unlocked it and he rolled over and fell back asleep. I took the phone from our child and went on his Snapchat and he’s conversing with HIGH SCHOOL GIRLS y’all. He’s commenting heart eyes under their pics, he even made a comment saying that’s said “someone is going to scoop you up!” I was looking through his friends on snap and I saw a good bit of really young girls between the agents of 17-19. I mean, you’re 30 with two kids what do you have in common with someone in the 12th grade. I know he KNOWS these girls are in high school because he liked their prom pics and you can clearly see these girls are in a high school uniform. I confronted him about it and he was SPEECHLESS and to be honest I don’t think he had the right words for me. His only response was “I know why you’re upset and you have every right to be.” I wasted SEVEN years with this CREEP! Ladies, what is your take on this? What would you do?