Is he using me?

My live in boyfriend of two years told me about a month ago he needed a break after a fight. I have been staying with my parents and texting him still everyday. Every time I ask him when I can come home he says he isn't sure. He won't tell me he loves me anymore either. Lately he's been wanting to have sex and when I turn him down he gets mad and refuses to talk to me. Why is he doing this? Is he using me? Should I stop wasting my time on him?
Is he using me?
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