Not sure what can be done..?

So me and my ex boyfriend have been broken up for a year and a half(he did the breaking up) It didn't end badly and we were able to remain friends, which turned into a fwb situation. Things were good for a while until we started fighting more and more and they got more worse each time. We recently just had our latest blowout and i also just got a new boyfriend. We talked last night and he's not even sure he still wants to be friends at this point, he doesn't think it's possible. I still do however and id really hate to throw a friendship away, even though we fight, he's still my best friend. He says he just doesn't care anymore because we always fight over the same stupid stuff we did when we were dating and that things are complicated now and are going to be different because wew won't be close anymore because we aren't cuddling/ having sex. He thinks it's impossible to remain friends when we won't be as close as we were and now that i have a boyfriend. He seems generally upset but i just don't understand why we still cant remain friends without having sex/cuddling. We will still be close, Just not in that aspect. I want to make it work because we are great friends but now i'm also debating it too. Should it just be called quits between us? Has too much really gone on and changed? Is it really impossible to fix this time? I have a bunch of stuff to get back to him but i was going to wait until i decided to end it or not, Included in that is a box of stuff from when we were together, Pics, cards, exc..That if i'm calling it quits on everything i really just don't want. Would giving this stuff back and telling him its best its over hurt him, i don't want to hurt him but its not stuff i wanna hold onto. Its too hard and i feel like this situation has gotten out of hand but i just dont know what to do anymore. im torn. any advice or insight is much appreciated