I [21F] feel like i need space from my boyfriend [21M] how does this not become a problem?

Me and my boyfriend have been together since March of last year. We went through two break ups, the first one because I wasn't sure I loved him as much as him and it made me feel guilty and overwhelmed and one because I had a crush on a random guy while i was away in another country and we couldn't figure things out, though nothing happened with that guy. We've been back together since around February now, and it felt like a great relationship. I finally felt like i truly loved him, and even if we went through issues because of my anxious attachment, we worked through it.

Now, i feel like i want more space from him. We talked about me moving to his place (we live only a few minutes from each other's place) but now I'm not sure i want it anymore and it makes him feel betrayed. I just feel like I need more time to myself alone. He says if i want that i can just go to my place, as i'm still keeping it, but I feel like it's not the same. I feel like i would hate being stuck with him in the same small apartment all the time. I feel like i would hate having to sleep with him more often. I don't feel like having sex with him that much, it feels more like a chore than anything, and i'm scared i'm gonna lead this relationship to a break up.

I really enjoy spending time with him and texting him, i think i still love him, but for a reason i can't explain, i feel like I don't want our lives to merge as much as he would like. I feel like i'm still young and can't commit to this as much as he would like, even if a few months earlier i felt so sure of myself.

This is making me guilty and stuck, and i have no idea of what to do and what to say. I don't want to force myself to do things i don't want to do but at the same time I know it's making him feel bad, and i don't want to break up with him but i'm scared that if it continues this way we'll have to.

His vision of a couple is one that live together, i haven't figured out everything yet about myself personally and even if i was kind of sure then i don't feel like i am now.

What do i have to do?