How do you know when it's time to walk away/end a relationship?

I really love my boyfriend. I tried texting him today & he told me to go away. He said he was tired from working all day. We have been arguing lately. But i don't understand why he had to be mean & not give me a few minutes of his day. I don't feel as important to him anymore. I feel like he ignores me & never wants to see me. I feel like he only uses me for sex & that's what keeps us together. We just never see eye to eye. & we always accuse each other of treating each other bad. I don't know whether to stay or to walk away 😢

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