Should I move on ?

Okay so here the thing.

Ive been seeing this guy since December & we instantly connected. As time pass he then says that he isn’t ready for a relationship ... okay I respect that. As time continue to fly he then re appears and tells me he wants to work things out. We try again. And again he ends it. He’s sister would make comments about he’s ex as if she’s around and I immediately dropped it until recently when I went back with him. I feel as if I’m he’s last resort, as if he doesn’t care. I’m having a hard time moving on because he was so great to me. Yet we don’t talk unless he wants to fuck.