Socialisation

my boyfriend with autism recently broke up with me, he told me that he still loves and cares for me but is overwhelmed in the relationship, I really care for him and I made some mistakes in our relationship, we are both young but I really want us to work in the future, we’ve continued being friends and he says he wants to work on us but doesn’t have the effort or energy. We stayed friends but a few days after our breakup we slept together and it confused me. We can have fun being friends but I can’t help but hope in the back of my mind that he’s going to re-charge and want to resolve things again, I love him very dearly but he told me today that he wouldn’t care if any of his friends died, including me, he said he wished he didn’t feel that way and he doesn’t know how to change it. I can’t help but think he doesn’t care about me anymore and wether I should leave him alone or not? Because he wants to talk to me but I don’t know wether that’s the best decision for him. He can’t communicate his emotions and most of the time he shuts off his emotions and feels numb all of the time. Any advice on how I can help him or what I should do? I’ve tried research and I’ve done most the things that people have said but nothing seems to be working for him. He also had a bit of a breakdown when we talked about our relationship and he started to hit his head.